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<h1 class="libtitle">Library mathcomp.solvable.extremal</h1>

<div class="code">
<span class="comment">(*&nbsp;(c)&nbsp;Copyright&nbsp;2006-2016&nbsp;Microsoft&nbsp;Corporation&nbsp;and&nbsp;Inria.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>
&nbsp;Distributed&nbsp;under&nbsp;the&nbsp;terms&nbsp;of&nbsp;CeCILL-B.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*)</span><br/>
<span class="id" title="keyword">Require</span> <span class="id" title="keyword">Import</span> <a class="idref" href="mathcomp.ssreflect.ssreflect.html#"><span class="id" title="library">mathcomp.ssreflect.ssreflect</span></a>.<br/>

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</div>

<div class="doc">
    This file contains the definition and properties of extremal p-groups;  
 it covers and is mostly based on the beginning of Aschbacher, section 23,  
 as well as several exercises of this section.                              
   We define canonical representatives for the group classes that cover the 
 extremal p-groups (non-abelian p-groups with a cyclic maximal subgroup):   
 'Mod_m == the modular group of order m, for m = p ^ n, p prime and n &gt;= 3. 
   'D_m == the dihedral group of order m, for m = 2n &gt;= 4.                  
   'Q_m == the generalized quaternion group of order m, for m = 2 ^ n &gt;= 8. 
  'SD_m == the semi-dihedral group of order m, for m = 2 ^ n &gt;= 16.         
 In each case the notation is defined in the %type, %g and %G scopes, where 
 it denotes a finGroupType, a full gset and the full group for that type.   
 However each notation is only meaningful under the given conditions, in    
 'D_m is only an extremal group for m = 2 ^ n &gt;= 8, and 'D_8 = 'Mod_8 (they 
 are, in fact, beta-convertible).                                           
   We also define                                                           
  extremal_generators G p n (x, y) &lt;-&gt; G has order p ^ n, x in G has order  
            p ^ n.-1, and y is in G \ &lt; [x]&gt;: thus &lt; [x]&gt; has index p in G,   
            so if p is prime, &lt; [x]&gt; is maximal in G, G is generated by x    
            and y, and G is extremal or abelian.                            
  extremal_class G == the class of extremal groups G belongs to: one of     
           ModularGroup, Dihedral, Quaternion, SemiDihedral or NotExtremal. 
  extremal2 G &lt;=&gt; extremal_class G is one of Dihedral, Quaternion, or       
           SemiDihedral; this allows 'D_4 and 'D_8, but excludes 'Mod(2^n) 
           for n &gt; 3.                                                       
  modular_group_generators p n (x, y) &lt;-&gt; y has order p and acts on x via   
           x ^ y = x ^+ (p ^ n.-2).+1. This is the complement to            
          extremal_generators G p n (x, y) for modular groups.              
 We provide cardinality, presentation, generator and structure theorems for 
 each class of extremal group. The extremal_generators predicate is used to 
 supply structure theorems with all the required data about G; this is      
 completed by an isomorphism assumption (e.g., G \isog 'D(2 ^ n)), and     
 sometimes other properties (e.g., # [y] == 2 in the semidihedral case). The 
 generators assumption can be deduced generically from the isomorphism      
 assumption, or it can be proved manually for a specific choice of x and y. 
  The extremal_class function is used to formulate synthetic theorems that  
 cover several classes of extremal groups (e.g., Aschbacher ex. 8.3).        
</div>
<div class="code">

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<span class="id" title="keyword">Set Implicit Arguments</span>.<br/>

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<span class="id" title="keyword">Local Open</span> <span class="id" title="keyword">Scope</span> <span class="id" title="var">ring_scope</span>.<br/>
<span class="id" title="keyword">Import</span> <span class="id" title="var">GroupScope</span> <span class="id" title="var">GRing.Theory</span>.<br/>

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<span class="id" title="keyword">Reserved Notation</span> &quot;''Mod_' m" (<span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 8, <span class="id" title="var">m</span> <span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 2, <span class="id" title="var">format</span> "''Mod_' m").<br/>
<span class="id" title="keyword">Reserved Notation</span> &quot;''D_' m" (<span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 8, <span class="id" title="var">m</span> <span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 2, <span class="id" title="var">format</span> "''D_' m").<br/>
<span class="id" title="keyword">Reserved Notation</span> &quot;''SD_' m" (<span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 8, <span class="id" title="var">m</span> <span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 2, <span class="id" title="var">format</span> "''SD_' m").<br/>
<span class="id" title="keyword">Reserved Notation</span> &quot;''Q_' m" (<span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 8, <span class="id" title="var">m</span> <span class="id" title="tactic">at</span> <span class="id" title="keyword">level</span> 2, <span class="id" title="var">format</span> "''Q_' m").<br/>

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<span class="id" title="keyword">Module</span> <a name="Extremal"><span class="id" title="module">Extremal</span></a>.<br/>

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<span class="id" title="keyword">Section</span> <a name="Extremal.Construction"><span class="id" title="section">Construction</span></a>.<br/>

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<span class="id" title="keyword">Variables</span> <a name="Extremal.Construction.q"><span class="id" title="variable">q</span></a> <a name="Extremal.Construction.p"><span class="id" title="variable">p</span></a> <a name="Extremal.Construction.e"><span class="id" title="variable">e</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>.<br/>
</div>

<div class="doc">
 Construct the semi-direct product of 'Z_q by 'Z_p with 1%R ^ 1%R = e%R,    
 if possible, i.e., if p, q &gt; 1 and there is s \in Aut 'Z_p such that       
 # [s] %| p  and s 1%R = 1%R ^+ e.                                            
</div>
<div class="code">

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<span class="id" title="keyword">Let</span> <a name="Extremal.Construction.a"><span class="id" title="variable">a</span></a> : <a class="idref" href="mathcomp.algebra.zmodp.html#9daeb9ead3dc7cfd1f9338b8de9c8c09"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.algebra.zmodp.html#9daeb9ead3dc7cfd1f9338b8de9c8c09"><span class="id" title="notation">Z_p</span></a> := <a class="idref" href="mathcomp.algebra.zmodp.html#Zp1"><span class="id" title="definition">Zp1</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="Extremal.Construction.b"><span class="id" title="variable">b</span></a> : <a class="idref" href="mathcomp.algebra.zmodp.html#9daeb9ead3dc7cfd1f9338b8de9c8c09"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.algebra.zmodp.html#9daeb9ead3dc7cfd1f9338b8de9c8c09"><span class="id" title="notation">Z_q</span></a> := <a class="idref" href="mathcomp.algebra.zmodp.html#Zp1"><span class="id" title="definition">Zp1</span></a>.<br/>

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<span class="id" title="keyword">Definition</span> <a name="Extremal.aut_of"><span class="id" title="definition">aut_of</span></a> :=<br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#odflt"><span class="id" title="abbreviation">odflt</span></a> 1 <a class="idref" href="mathcomp.ssreflect.fintype.html#6e41fc9f538219673a88921206e95f4a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#6e41fc9f538219673a88921206e95f4a"><span class="id" title="notation">pick</span></a> <span class="id" title="var">s</span> <a class="idref" href="mathcomp.ssreflect.fintype.html#6e41fc9f538219673a88921206e95f4a"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.fingroup.automorphism.html#Aut"><span class="id" title="definition">Aut</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.B"><span class="id" title="abbreviation">B</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#6e41fc9f538219673a88921206e95f4a"><span class="id" title="notation">|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="mathcomp.ssreflect.fintype.html#6e41fc9f538219673a88921206e95f4a"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#aa34fd1c61c5cf0a3356b624a5d2afed"><span class="id" title="notation">%|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.p"><span class="id" title="variable">p</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.b"><span class="id" title="variable">b</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.b"><span class="id" title="variable">b</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.e"><span class="id" title="variable">e</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#6e41fc9f538219673a88921206e95f4a"><span class="id" title="notation">]</span></a>.<br/>

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<span class="id" title="keyword">Lemma</span> <a name="Extremal.aut_dvdn"><span class="id" title="lemma">aut_dvdn</span></a> : <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#Extremal.aut_of"><span class="id" title="definition">aut_of</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#aa34fd1c61c5cf0a3356b624a5d2afed"><span class="id" title="notation">%|</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.a"><span class="id" title="variable">a</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="Extremal.act_morphism"><span class="id" title="definition">act_morphism</span></a> := <a class="idref" href="mathcomp.solvable.cyclic.html#eltm_morphism"><span class="id" title="definition">eltm_morphism</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.aut_dvdn"><span class="id" title="lemma">aut_dvdn</span></a>.<br/>

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<span class="id" title="keyword">Definition</span> <a name="Extremal.base_act"><span class="id" title="definition">base_act</span></a> := (<a class="idref" href="mathcomp.fingroup.action.html#bbbd7c93723feb1df75c7fc60aa27b88"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.fingroup.action.html#bbbd7c93723feb1df75c7fc60aa27b88"><span class="id" title="notation">Aut</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.B"><span class="id" title="abbreviation">B</span></a><a class="idref" href="mathcomp.fingroup.action.html#bbbd7c93723feb1df75c7fc60aa27b88"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.fingroup.action.html#66f424a4bc70f81c17ca6c6cb9254216"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.action.html#66f424a4bc70f81c17ca6c6cb9254216"><span class="id" title="notation">o</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.act_morphism"><span class="id" title="definition">act_morphism</span></a>)%<span class="id" title="var">gact</span>.<br/>

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<span class="id" title="keyword">Lemma</span> <a name="Extremal.act_dom"><span class="id" title="lemma">act_dom</span></a> : <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.a"><span class="id" title="variable">a</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.fingroup.action.html#act_dom"><span class="id" title="definition">act_dom</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.base_act"><span class="id" title="definition">base_act</span></a>.<br/>

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<span class="id" title="keyword">Definition</span> <a name="Extremal.gact"><span class="id" title="definition">gact</span></a> := (<a class="idref" href="mathcomp.solvable.extremal.html#Extremal.base_act"><span class="id" title="definition">base_act</span></a> <a class="idref" href="mathcomp.fingroup.action.html#9590c91d152ef8d2e38e09f16e80a814"><span class="id" title="notation">\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.act_dom"><span class="id" title="lemma">act_dom</span></a>)%<span class="id" title="var">gact</span>.<br/>
<span class="id" title="keyword">Fact</span> <a name="Extremal.gtype_key"><span class="id" title="lemma">gtype_key</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#unit"><span class="id" title="inductive">unit</span></a>.  <br/>
<span class="id" title="keyword">Definition</span> <a name="Extremal.gtype"><span class="id" title="definition">gtype</span></a> := <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#locked_with"><span class="id" title="definition">locked_with</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.gtype_key"><span class="id" title="lemma">gtype_key</span></a> (<a class="idref" href="mathcomp.fingroup.gproduct.html#sdprod_groupType"><span class="id" title="definition">sdprod_groupType</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.gact"><span class="id" title="definition">gact</span></a>).<br/>

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<span class="id" title="keyword">Hypotheses</span> (<a name="Extremal.Construction.p_gt1"><span class="id" title="variable">p_gt1</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1) (<a name="Extremal.Construction.q_gt1"><span class="id" title="variable">q_gt1</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1).<br/>

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<span class="id" title="keyword">Lemma</span> <a name="Extremal.card"><span class="id" title="lemma">card</span></a> : <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.gtype"><span class="id" title="definition">gtype</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#697e4695610f677ae98a52af81f779d2"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.q"><span class="id" title="variable">q</span></a>)%<span class="id" title="var">N</span>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="Extremal.Grp"><span class="id" title="lemma">Grp</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">∃</span></a> <span class="id" title="var">s</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.fingroup.automorphism.html#Aut"><span class="id" title="definition">Aut</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.B"><span class="id" title="abbreviation">B</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#aa34fd1c61c5cf0a3356b624a5d2afed"><span class="id" title="notation">%|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.b"><span class="id" title="variable">b</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.b"><span class="id" title="variable">b</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.e"><span class="id" title="variable">e</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.gtype"><span class="id" title="definition">gtype</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction.e"><span class="id" title="variable">e</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal.Construction"><span class="id" title="section">Construction</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#Extremal"><span class="id" title="module">Extremal</span></a>.<br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="SpecializeExtremals"><span class="id" title="section">SpecializeExtremals</span></a>.<br/>

<br/>
<span class="id" title="keyword">Import</span> <span class="id" title="var">Extremal</span>.<br/>

<br/>
<span class="id" title="keyword">Variable</span> <a name="SpecializeExtremals.m"><span class="id" title="variable">m</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="SpecializeExtremals.p"><span class="id" title="variable">p</span></a> := <a class="idref" href="mathcomp.ssreflect.prime.html#pdiv"><span class="id" title="definition">pdiv</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.m"><span class="id" title="variable">m</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="SpecializeExtremals.q"><span class="id" title="variable">q</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#df17451da28eb630dbb51b12706ba39e"><span class="id" title="notation">%/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.p"><span class="id" title="variable">p</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="modular_gtype"><span class="id" title="definition">modular_gtype</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#gtype"><span class="id" title="definition">gtype</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#df17451da28eb630dbb51b12706ba39e"><span class="id" title="notation">%/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">).+1</span></a>.<br/>
<span class="id" title="keyword">Definition</span> <a name="dihedral_gtype"><span class="id" title="definition">dihedral_gtype</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#gtype"><span class="id" title="definition">gtype</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>.<br/>
<span class="id" title="keyword">Definition</span> <a name="semidihedral_gtype"><span class="id" title="definition">semidihedral_gtype</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#gtype"><span class="id" title="definition">gtype</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a> 2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#df17451da28eb630dbb51b12706ba39e"><span class="id" title="notation">%/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">).-1</span></a>.<br/>
<span class="id" title="keyword">Definition</span> <a name="quaternion_kernel"><span class="id" title="definition">quaternion_kernel</span></a> :=<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&lt;&lt;</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#20dd00d77a881552893c96be95088d1a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#20dd00d77a881552893c96be95088d1a"><span class="id" title="notation">set</span></a> <span class="id" title="var">u</span> <a class="idref" href="mathcomp.ssreflect.finset.html#20dd00d77a881552893c96be95088d1a"><span class="id" title="notation">|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#u"><span class="id" title="variable">u</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2 <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 1<a class="idref" href="mathcomp.ssreflect.finset.html#20dd00d77a881552893c96be95088d1a"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#c4eb68ed64baca4028c54e8eaca3672a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#c4eb68ed64baca4028c54e8eaca3672a"><span class="id" title="notation">set</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#u"><span class="id" title="variable">u</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2 <a class="idref" href="mathcomp.ssreflect.finset.html#c4eb68ed64baca4028c54e8eaca3672a"><span class="id" title="notation">|</span></a> <span class="id" title="var">u</span> <a class="idref" href="mathcomp.ssreflect.finset.html#c4eb68ed64baca4028c54e8eaca3672a"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gtype"><span class="id" title="definition">gtype</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a> 4 <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#c4eb68ed64baca4028c54e8eaca3672a"><span class="id" title="notation">]</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&gt;&gt;</span></a>.<br/>
<span class="id" title="keyword">Definition</span> <a name="quaternion_gtype"><span class="id" title="definition">quaternion_gtype</span></a> :=<br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#locked_with"><span class="id" title="definition">locked_with</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gtype_key"><span class="id" title="lemma">gtype_key</span></a> (<a class="idref" href="mathcomp.fingroup.quotient.html#coset_groupType"><span class="id" title="definition">coset_groupType</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#quaternion_kernel"><span class="id" title="definition">quaternion_kernel</span></a>).<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#SpecializeExtremals"><span class="id" title="section">SpecializeExtremals</span></a>.<br/>

<br/>
<span class="id" title="keyword">Notation</span> <a name="25bc175305a0737f57c9ca1bc1cac0d9"><span class="id" title="notation">&quot;</span></a>''Mod_' m" := (<a class="idref" href="mathcomp.solvable.extremal.html#modular_gtype"><span class="id" title="definition">modular_gtype</span></a> <span class="id" title="var">m</span>) : <span class="id" title="var">type_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">&quot;</span></a>''Mod_' m" := <a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#25bc175305a0737f57c9ca1bc1cac0d9"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#25bc175305a0737f57c9ca1bc1cac0d9"><span class="id" title="notation">Mod_m</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a> : <span class="id" title="var">group_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="f3edeeb33ea160447fceee3f589d0f32"><span class="id" title="notation">&quot;</span></a>''Mod_' m" := <a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#25bc175305a0737f57c9ca1bc1cac0d9"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#25bc175305a0737f57c9ca1bc1cac0d9"><span class="id" title="notation">Mod_m</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">]</span></a>%<span class="id" title="var">G</span> : <span class="id" title="var">Group_scope</span>.<br/>

<br/>
<span class="id" title="keyword">Notation</span> <a name="45d84f5adfeba17401fde325df6b51c9"><span class="id" title="notation">&quot;</span></a>''D_' m" := (<a class="idref" href="mathcomp.solvable.extremal.html#dihedral_gtype"><span class="id" title="definition">dihedral_gtype</span></a> <span class="id" title="var">m</span>) : <span class="id" title="var">type_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">&quot;</span></a>''D_' m" := <a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#45d84f5adfeba17401fde325df6b51c9"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#45d84f5adfeba17401fde325df6b51c9"><span class="id" title="notation">D_m</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a> : <span class="id" title="var">group_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="b0d5297fef749da9d64c12ad441590cc"><span class="id" title="notation">&quot;</span></a>''D_' m" := <a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#45d84f5adfeba17401fde325df6b51c9"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#45d84f5adfeba17401fde325df6b51c9"><span class="id" title="notation">D_m</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">]</span></a>%<span class="id" title="var">G</span> : <span class="id" title="var">Group_scope</span>.<br/>

<br/>
<span class="id" title="keyword">Notation</span> <a name="86b32965148d66bf7e4e9317d04ba894"><span class="id" title="notation">&quot;</span></a>''SD_' m" := (<a class="idref" href="mathcomp.solvable.extremal.html#semidihedral_gtype"><span class="id" title="definition">semidihedral_gtype</span></a> <span class="id" title="var">m</span>) : <span class="id" title="var">type_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="622744278f4dd42603c699fb184123e7"><span class="id" title="notation">&quot;</span></a>''SD_' m" := <a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#86b32965148d66bf7e4e9317d04ba894"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#86b32965148d66bf7e4e9317d04ba894"><span class="id" title="notation">SD_m</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a> : <span class="id" title="var">group_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="e46ab76310f26a405b9945a43d59c801"><span class="id" title="notation">&quot;</span></a>''SD_' m" := <a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#86b32965148d66bf7e4e9317d04ba894"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#86b32965148d66bf7e4e9317d04ba894"><span class="id" title="notation">SD_m</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">]</span></a>%<span class="id" title="var">G</span> : <span class="id" title="var">Group_scope</span>.<br/>

<br/>
<span class="id" title="keyword">Notation</span> <a name="b96b34ad18a7135758c99d8cad331d31"><span class="id" title="notation">&quot;</span></a>''Q_' m" := (<a class="idref" href="mathcomp.solvable.extremal.html#quaternion_gtype"><span class="id" title="definition">quaternion_gtype</span></a> <span class="id" title="var">m</span>) : <span class="id" title="var">type_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">&quot;</span></a>''Q_' m" := <a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#b96b34ad18a7135758c99d8cad331d31"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#b96b34ad18a7135758c99d8cad331d31"><span class="id" title="notation">Q_m</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#26c09fa7b21f5311d68f07b2527cd1eb"><span class="id" title="notation">]</span></a> : <span class="id" title="var">group_scope</span>.<br/>
<span class="id" title="keyword">Notation</span> <a name="24d327e6c4148d6dd7b561fa4e1277bd"><span class="id" title="notation">&quot;</span></a>''Q_' m" := <a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">set</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#gsort"><span class="id" title="abbreviation">gsort</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#b96b34ad18a7135758c99d8cad331d31"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#b96b34ad18a7135758c99d8cad331d31"><span class="id" title="notation">Q_m</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a9a62cd128c968b470b51a9773e2f64a"><span class="id" title="notation">]</span></a>%<span class="id" title="var">G</span> : <span class="id" title="var">Group_scope</span>.<br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory"><span class="id" title="section">ExtremalTheory</span></a>.<br/>

<br/>
<span class="id" title="keyword">Implicit</span> <span class="id" title="keyword">Types</span> (<span class="id" title="var">gT</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#FinGroup.Exports.finGroupType"><span class="id" title="abbreviation">finGroupType</span></a>) (<span class="id" title="var">p</span> <span class="id" title="var">q</span> <span class="id" title="var">m</span> <span class="id" title="var">n</span> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>).<br/>

<br/>
</div>

<div class="doc">
 This is Aschbacher (23.3), with the isomorphism made explicit, and a       
 slightly reworked case analysis on the prime and exponent; in particular   
 the inverting involution is available for all non-trivial p-cycles.         
</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="cyclic_pgroup_Aut_structure"><span class="id" title="lemma">cyclic_pgroup_Aut_structure</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#36625695d37b6869c156bfcdf13834f7"><span class="id" title="notation">:!=:</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">q</span> := <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">n</span> := <a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.ssreflect.prime.html#logn"><span class="id" title="definition">logn</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">).-1</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">A</span> := <a class="idref" href="mathcomp.fingroup.automorphism.html#Aut"><span class="id" title="definition">Aut</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">P</span> := <a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">O_p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">)</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">F</span> := <a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">O_p</span></a><a class="idref" href="mathcomp.ssreflect.prime.html#233366c70a33ee49ba3eedb41626d66a"><span class="id" title="notation">^'</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5a60f5e4463d132504644978fbcd8502"><span class="id" title="notation">)</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">∃</span></a> <span class="id" title="var">m</span> : <a class="idref" href="mathcomp.fingroup.perm.html#8787ba8c1ae558dde17e1bdb8427679e"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.perm.html#8787ba8c1ae558dde17e1bdb8427679e"><span class="id" title="notation">perm</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.perm.html#8787ba8c1ae558dde17e1bdb8427679e"><span class="id" title="notation">}</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.algebra.zmodp.html#9daeb9ead3dc7cfd1f9338b8de9c8c09"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.algebra.zmodp.html#9daeb9ead3dc7cfd1f9338b8de9c8c09"><span class="id" title="notation">Z_q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">a</span> <span class="id" title="var">x</span>, <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 1%<span class="id" title="var">R</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">&amp;,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#a0fd72584f326d7220475d01d3fceccd"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#a0fd72584f326d7220475d01d3fceccd"><span class="id" title="notation">morph</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#a0fd72584f326d7220475d01d3fceccd"><span class="id" title="notation">:</span></a> <span class="id" title="var">a</span> <span class="id" title="var">b</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#a0fd72584f326d7220475d01d3fceccd"><span class="id" title="notation">/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#b"><span class="id" title="variable">b</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#a0fd72584f326d7220475d01d3fceccd"><span class="id" title="notation">&gt;-&gt;</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a> <a class="idref" href="mathcomp.algebra.ssralg.html#22058a36a53dac65c94ca403bc62650a"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#b"><span class="id" title="variable">b</span></a>)%<span class="id" title="var">R</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#a0fd72584f326d7220475d01d3fceccd"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">&amp;,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#injective"><span class="id" title="definition">injective</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2bba53854f326a714d377124cccec593"><span class="id" title="notation">}</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#image"><span class="id" title="abbreviation">image</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#20bf07099d6d8cf369383b22fd37862e"><span class="id" title="notation">=</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#20bf07099d6d8cf369383b22fd37862e"><span class="id" title="notation">i</span></a> <a class="idref" href="mathcomp.algebra.ssralg.html#GRing.unit"><span class="id" title="definition">GRing.unit</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="id" title="keyword">∀</span> <span class="id" title="var">k</span>, <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">morph</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">:</span></a> <span class="id" title="var">a</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">&gt;-&gt;</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a> <a class="idref" href="mathcomp.algebra.ssralg.html#fb22424322c3d7eb9b837dfca65ce21e"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a>)%<span class="id" title="var">R</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">morph</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">:</span></a> <span class="id" title="var">a</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a605acbeae7597f74f5a9b816ed8a717"><span class="id" title="notation">^-1</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">&gt;-&gt;</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#a"><span class="id" title="variable">a</span></a><a class="idref" href="mathcomp.algebra.ssralg.html#f3016d4e55aa553d3e912592ec65e342"><span class="id" title="notation">^-1</span></a>)%<span class="id" title="var">R</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#59b5bb4add86e1e9ecbe874e74b2216e"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#abelian"><span class="id" title="definition">abelian</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#F"><span class="id" title="variable">F</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#F"><span class="id" title="variable">F</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><br/>
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&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">∃</span></a> <span class="id" title="var">s</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>)%<span class="id" title="var">N</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 5<a class="idref" href="mathcomp.algebra.ssralg.html#af5c1d7e13410a0a6c3dff5441ac8477"><span class="id" title="notation">%:</span></a><a class="idref" href="mathcomp.algebra.ssralg.html#af5c1d7e13410a0a6c3dff5441ac8477"><span class="id" title="notation">R</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#3733c0e43956ad2062ab5f1e57ceb9a8"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.gproduct.html#3733c0e43956ad2062ab5f1e57ceb9a8"><span class="id" title="notation">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">∃</span></a> <span class="id" title="var">s0</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#s0"><span class="id" title="variable">s0</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s0"><span class="id" title="variable">s0</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#s0"><span class="id" title="variable">s0</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">).+1</span></a><a class="idref" href="mathcomp.algebra.ssralg.html#af5c1d7e13410a0a6c3dff5441ac8477"><span class="id" title="notation">%:</span></a><a class="idref" href="mathcomp.algebra.ssralg.html#af5c1d7e13410a0a6c3dff5441ac8477"><span class="id" title="notation">R</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#s0"><span class="id" title="variable">s0</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a>) <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">).-1</span></a><a class="idref" href="mathcomp.algebra.ssralg.html#af5c1d7e13410a0a6c3dff5441ac8477"><span class="id" title="notation">%:</span></a><a class="idref" href="mathcomp.algebra.ssralg.html#af5c1d7e13410a0a6c3dff5441ac8477"><span class="id" title="notation">R</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s"><span class="id" title="variable">s</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#s0"><span class="id" title="variable">s0</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <span class="id" title="var">gT</span> (<span class="id" title="var">A</span> : <a class="idref" href="mathcomp.ssreflect.finset.html#0fec877de6d09ef39abb9b599a84eb0e"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#0fec877de6d09ef39abb9b599a84eb0e"><span class="id" title="notation">set</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#0fec877de6d09ef39abb9b599a84eb0e"><span class="id" title="notation">}</span></a>) <span class="id" title="var">p</span> <span class="id" title="var">n</span> <span class="id" title="var">xy</span> :=<br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span>: <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <span class="id" title="var">y</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <span class="id" title="var">x</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><span class="id" title="var">x</span><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>)%<span class="id" title="var">N</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <span class="id" title="var">y</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><span class="id" title="var">x</span><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="extremal_generators_facts"><span class="id" title="lemma">extremal_generators_facts</span></a> <span class="id" title="var">gT</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) <span class="id" title="var">p</span> <span class="id" title="var">n</span> <span class="id" title="var">x</span> <span class="id" title="var">y</span> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.ssreflect.prime.html#prime"><span class="id" title="definition">prime</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.gseries.html#maximal"><span class="id" title="definition">maximal</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#c27c638e534bbb5b7de2d4b4aa0a3e82"><span class="id" title="notation">&lt;|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#3cae19671031307d430e5b14ccbd1058"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#3cae19671031307d430e5b14ccbd1058"><span class="id" title="notation">N</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#3cae19671031307d430e5b14ccbd1058"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#3cae19671031307d430e5b14ccbd1058"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory.ModularGroup"><span class="id" title="section">ModularGroup</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variables</span> <a name="ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a name="ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.m"><span class="id" title="variable">m</span></a> := (<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a> := (<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a> := (<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#b870774a3786e6850cf468108b4e1ee5"><span class="id" title="notation">.-2</span></a>)%<span class="id" title="var">N</span>.<br/>

<br/>
<span class="id" title="keyword">Hypotheses</span> (<a name="ExtremalTheory.ModularGroup.p_pr"><span class="id" title="variable">p_pr</span></a> : <a class="idref" href="mathcomp.ssreflect.prime.html#prime"><span class="id" title="definition">prime</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a>) (<a name="ExtremalTheory.ModularGroup.n_gt2"><span class="id" title="variable">n_gt2</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2).<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.p_gt1"><span class="id" title="variable">p_gt1</span></a> := <a class="idref" href="mathcomp.ssreflect.prime.html#prime_gt1"><span class="id" title="lemma">prime_gt1</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p_pr"><span class="id" title="variable">p_pr</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.p_gt0"><span class="id" title="variable">p_gt0</span></a> := <a class="idref" href="mathcomp.ssreflect.ssrnat.html#ltnW"><span class="id" title="lemma">ltnW</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p_gt1"><span class="id" title="variable">p_gt1</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.def_n"><span class="id" title="variable">def_n</span></a> := <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#esym"><span class="id" title="definition">esym</span></a> (<a class="idref" href="mathcomp.ssreflect.ssrnat.html#subnKC"><span class="id" title="lemma">subnKC</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n_gt2"><span class="id" title="variable">n_gt2</span></a>).<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.def_p"><span class="id" title="variable">def_p</span></a> : <a class="idref" href="mathcomp.ssreflect.prime.html#pdiv"><span class="id" title="definition">pdiv</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a>.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.def_q"><span class="id" title="variable">def_q</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#df17451da28eb630dbb51b12706ba39e"><span class="id" title="notation">%/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a>.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.def_r"><span class="id" title="variable">def_r</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#df17451da28eb630dbb51b12706ba39e"><span class="id" title="notation">%/</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a>.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.ltqm"><span class="id" title="variable">ltqm</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#989c98e7ddd65d5bf37c334ff2076de8"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.m"><span class="id" title="variable">m</span></a>.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.ltrq"><span class="id" title="variable">ltrq</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#989c98e7ddd65d5bf37c334ff2076de8"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a>.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.r_gt0"><span class="id" title="variable">r_gt0</span></a> : 0 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#989c98e7ddd65d5bf37c334ff2076de8"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a>.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ModularGroup.q_gt1"><span class="id" title="variable">q_gt1</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1.  <br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="card_modular_group"><span class="id" title="lemma">card_modular_group</span></a> : <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span>.<br/>
 
<br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp_modular_group"><span class="id" title="lemma">Grp_modular_group</span></a> :<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">.+1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="modular_group_generators"><span class="id" title="definition">modular_group_generators</span></a> <span class="id" title="var">gT</span> (<span class="id" title="var">xy</span> : <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#d19c7eafd0e2d195d10df94b392087b5"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a>) :=<br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span>: <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <span class="id" title="var">y</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a> <span class="id" title="tactic">in</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><span class="id" title="var">y</span><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <span class="id" title="var">y</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">.+1</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="generators_modular_group"><span class="id" title="lemma">generators_modular_group</span></a> <span class="id" title="var">gT</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">xy</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#modular_group_generators"><span class="id" title="definition">modular_group_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a>.<br/>

<br/>
</div>

<div class="doc">
 This is an adaptation of Aschbacher, exercise 8.2: 
<ul class="doclist">
<li> We allow an alternative to the # [x] = p ^ n.-1 condition that meshes    
    better with the modular_Grp lemma above.                                

</li>
<li> We state explicitly some "obvious" properties of G, namely that G is    
    the non-abelian semi-direct product &lt; [x]&gt; &gt;&lt;| &lt; [y]&gt; and that y ^+ j     
    acts on &lt; [x]&gt; via z |-&gt; z ^+ (j * p ^ n.-2).+1                          

</li>
<li> We also give the values of the 'Mho^k(G).                               

</li>
<li> We corrected a pair of typos.                                            
</li>
</ul>

</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="modular_group_structure"><span class="id" title="lemma">modular_group_structure</span></a> <span class="id" title="var">gT</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) <span class="id" title="var">x</span> <span class="id" title="var">y</span> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#modular_group_generators"><span class="id" title="definition">modular_group_generators</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">X</span> := <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#ff5a974c523b8d4c8927273818a26a02"><span class="id" title="notation">&gt;&lt;|</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#4b80c70cdb231351c5e129ba61f7f956"><span class="id" title="notation">~~</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#abelian"><span class="id" title="definition">abelian</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">z</span> <span class="id" title="var">j</span>, <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#j"><span class="id" title="variable">j</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#j"><span class="id" title="variable">j</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#697e4695610f677ae98a52af81f779d2"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">).+1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">Phi</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.nilpotent.html#nil_class"><span class="id" title="definition">nil_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="id" title="keyword">∀</span> <span class="id" title="var">k</span>, <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 0 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">Mho</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">^</span></a><a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a>2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> 3<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="id" title="keyword">∀</span> <span class="id" title="var">k</span>, 0 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#432e31800fc09abd260feb634dbbd1af"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#432e31800fc09abd260feb634dbbd1af"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#9482aae3d3b06e249765c1225dbb8cbb"><span class="id" title="notation">-</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">.+1</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#3733c0e43956ad2062ab5f1e57ceb9a8"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.gproduct.html#3733c0e43956ad2062ab5f1e57ceb9a8"><span class="id" title="notation">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_k</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_k</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#361454269931ea8643f7b402f2ab7222"><span class="id" title="notation">.+1</span></a>)%<span class="id" title="var">N</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ModularGroup"><span class="id" title="section">ModularGroup</span></a>.<br/>

<br/>
</div>

<div class="doc">
 Basic properties of dihedral groups; these will be refined for dihedral    
 2-groups in the section on extremal 2-groups.                               
</div>
<div class="code">
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory.DihedralGroup"><span class="id" title="section">DihedralGroup</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variable</span> <a name="ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>.<br/>
<span class="id" title="keyword">Hypothesis</span> <a name="ExtremalTheory.DihedralGroup.q_gt1"><span class="id" title="variable">q_gt1</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.DihedralGroup.m"><span class="id" title="variable">m</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#f460b977ac49dd1a229be682bc38c411"><span class="id" title="notation">.*2</span></a>.<br/>

<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.DihedralGroup.def2"><span class="id" title="variable">def2</span></a> : <a class="idref" href="mathcomp.ssreflect.prime.html#pdiv"><span class="id" title="definition">pdiv</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2.<br/>

<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.DihedralGroup.def_q"><span class="id" title="variable">def_q</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.m"><span class="id" title="variable">m</span></a> <a class="idref" href="mathcomp.ssreflect.div.html#df17451da28eb630dbb51b12706ba39e"><span class="id" title="notation">%/</span></a> <a class="idref" href="mathcomp.ssreflect.prime.html#pdiv"><span class="id" title="definition">pdiv</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a>.  <br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory.DihedralGroup.Dihedral_extension"><span class="id" title="section">Dihedral_extension</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variable</span> <a name="ExtremalTheory.DihedralGroup.Dihedral_extension.p"><span class="id" title="variable">p</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>.<br/>
<span class="id" title="keyword">Hypotheses</span> (<a name="ExtremalTheory.DihedralGroup.Dihedral_extension.p_gt1"><span class="id" title="variable">p_gt1</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.Dihedral_extension.p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1) (<a name="ExtremalTheory.DihedralGroup.Dihedral_extension.even_p"><span class="id" title="variable">even_p</span></a> : 2 <a class="idref" href="mathcomp.ssreflect.div.html#aa34fd1c61c5cf0a3356b624a5d2afed"><span class="id" title="notation">%|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.Dihedral_extension.p"><span class="id" title="variable">p</span></a>).<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="card_ext_dihedral"><span class="id" title="lemma">card_ext_dihedral</span></a> : <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ED"><span class="id" title="abbreviation">ED</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.Dihedral_extension.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#87e393a316922a3ff9e9f709674e598e"><span class="id" title="notation">./2</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#697e4695610f677ae98a52af81f779d2"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.m"><span class="id" title="variable">m</span></a>)%<span class="id" title="var">N</span>.<br/>
 
<br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp_ext_dihedral"><span class="id" title="lemma">Grp_ext_dihedral</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ED"><span class="id" title="abbreviation">ED</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.Dihedral_extension.p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5006c7a985edeed550bd2a6db74b0161"><span class="id" title="notation">^-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.Dihedral_extension"><span class="id" title="section">Dihedral_extension</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="card_dihedral"><span class="id" title="lemma">card_dihedral</span></a> : <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_m</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.m"><span class="id" title="variable">m</span></a>.<br/>
 
<br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp_dihedral"><span class="id" title="lemma">Grp_dihedral</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_m</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5006c7a985edeed550bd2a6db74b0161"><span class="id" title="notation">^-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>
 
<br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp'_dihedral"><span class="id" title="lemma">Grp'_dihedral</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_m</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#40473e5ae833bb83bfffbe406bfcb79c"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.DihedralGroup"><span class="id" title="section">DihedralGroup</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="involutions_gen_dihedral"><span class="id" title="lemma">involutions_gen_dihedral</span></a> <span class="id" title="var">gT</span> (<span class="id" title="var">x</span> <span class="id" title="var">y</span> : <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">G</span> := <a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&lt;&lt;</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#d251cae482ceced9589c8a2b3df261e7"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#d251cae482ceced9589c8a2b3df261e7"><span class="id" title="notation">set</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#d251cae482ceced9589c8a2b3df261e7"><span class="id" title="notation">;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#d251cae482ceced9589c8a2b3df261e7"><span class="id" title="notation">]</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&gt;&gt;</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#b1eeadc2feabc7422252baa895418c7b"><span class="id" title="notation">!=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp_2dihedral"><span class="id" title="lemma">Grp_2dihedral</span></a> <span class="id" title="var">n</span> : <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5006c7a985edeed550bd2a6db74b0161"><span class="id" title="notation">^-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="card_2dihedral"><span class="id" title="lemma">card_2dihedral</span></a> <span class="id" title="var">n</span> : <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="card_semidihedral"><span class="id" title="lemma">card_semidihedral</span></a> <span class="id" title="var">n</span> : <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">SD_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp_semidihedral"><span class="id" title="lemma">Grp_semidihedral</span></a> <span class="id" title="var">n</span> : <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">SD_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#b870774a3786e6850cf468108b4e1ee5"><span class="id" title="notation">.-2</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">).-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory.Quaternion"><span class="id" title="section">Quaternion</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variable</span> <a name="ExtremalTheory.Quaternion.n"><span class="id" title="variable">n</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>.<br/>
<span class="id" title="keyword">Hypothesis</span> <a name="ExtremalTheory.Quaternion.n_gt2"><span class="id" title="variable">n_gt2</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.Quaternion.m"><span class="id" title="variable">m</span></a> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.Quaternion.q"><span class="id" title="variable">q</span></a> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.Quaternion.r"><span class="id" title="variable">r</span></a> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#b870774a3786e6850cf468108b4e1ee5"><span class="id" title="notation">.-2</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.Quaternion.GrpQ"><span class="id" title="variable">GrpQ</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_m</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">Grp</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">:</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.presentation.html#953d1fbe50819ac104ff2928ed9f1f35"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.q"><span class="id" title="variable">q</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> 2 <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#93f82d9635dc31e1d0b435f42eb3dc73"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#0fbb201450901f2490e64ed12c373bb6"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.presentation.html#4783ea425920bc277a91db85db3ac693"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5006c7a985edeed550bd2a6db74b0161"><span class="id" title="notation">^-1</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#5b8f67ffc457596b97fe80b0e075accd"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.presentation.html#2e7e6fdc2fcc257cb8670b6b97d9b9ee"><span class="id" title="notation">)</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.Quaternion.defQ"><span class="id" title="variable">defQ</span></a> :  <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_m</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.GrpQ"><span class="id" title="variable">GrpQ</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="card_quaternion"><span class="id" title="lemma">card_quaternion</span></a> : <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_m</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.m"><span class="id" title="variable">m</span></a>.  <br/>
<span class="id" title="keyword">Lemma</span> <a name="Grp_quaternion"><span class="id" title="lemma">Grp_quaternion</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion.GrpQ"><span class="id" title="variable">GrpQ</span></a>.  <br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.Quaternion"><span class="id" title="section">Quaternion</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="eq_Mod8_D8"><span class="id" title="lemma">eq_Mod8_D8</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_8</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_8</span></a>.  <br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory.ExtremalStructure"><span class="id" title="section">ExtremalStructure</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variables</span> (<a name="ExtremalTheory.ExtremalStructure.gT"><span class="id" title="variable">gT</span></a> : <a class="idref" href="mathcomp.fingroup.fingroup.html#FinGroup.Exports.finGroupType"><span class="id" title="abbreviation">finGroupType</span></a>) (<a name="ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) (<a name="ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> : <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#nat"><span class="id" title="inductive">nat</span></a>).<br/>
<span class="id" title="keyword">Implicit</span> <span class="id" title="keyword">Type</span> <span class="id" title="var">H</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>.<br/>

<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.m"><span class="id" title="variable">m</span></a> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.q"><span class="id" title="variable">q</span></a> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.q_gt0"><span class="id" title="variable">q_gt0</span></a>: <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 0.  <br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#b870774a3786e6850cf468108b4e1ee5"><span class="id" title="notation">.-2</span></a>)%<span class="id" title="var">N</span>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.r_gt0"><span class="id" title="variable">r_gt0</span></a>: <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 0.  <br/>

<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.def2qr"><span class="id" title="variable">def2qr</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> 2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#697e4695610f677ae98a52af81f779d2"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.q"><span class="id" title="variable">q</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.m"><span class="id" title="variable">m</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> 2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#697e4695610f677ae98a52af81f779d2"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.q"><span class="id" title="variable">q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.q"><span class="id" title="variable">q</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#989c98e7ddd65d5bf37c334ff2076de8"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.m"><span class="id" title="variable">m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#989c98e7ddd65d5bf37c334ff2076de8"><span class="id" title="notation">&lt;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.q"><span class="id" title="variable">q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a>%<span class="id" title="var">N</span>.<br/>
 
<br/>
<span class="id" title="keyword">Lemma</span> <a name="generators_2dihedral"><span class="id" title="lemma">generators_2dihedral</span></a> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">xy</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">let</span>: <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <span class="id" title="var">y</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a> <span class="id" title="tactic">in</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><span class="id" title="var">y</span><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <span class="id" title="var">y</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <span class="id" title="var">x</span><a class="idref" href="mathcomp.fingroup.fingroup.html#a605acbeae7597f74f5a9b816ed8a717"><span class="id" title="notation">^-1</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="generators_semidihedral"><span class="id" title="lemma">generators_semidihedral</span></a> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">SD_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">xy</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">let</span>: <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <span class="id" title="var">y</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a> <span class="id" title="tactic">in</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><span class="id" title="var">y</span><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <span class="id" title="var">y</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="generators_quaternion"><span class="id" title="lemma">generators_quaternion</span></a> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">xy</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">let</span>: <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><span class="id" title="var">x</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <span class="id" title="var">y</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#xy"><span class="id" title="variable">xy</span></a> <span class="id" title="tactic">in</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><span class="id" title="var">y</span><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 4<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <span class="id" title="var">y</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <span class="id" title="var">x</span> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <span class="id" title="var">y</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <span class="id" title="var">x</span><a class="idref" href="mathcomp.fingroup.fingroup.html#a605acbeae7597f74f5a9b816ed8a717"><span class="id" title="notation">^-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variables</span> <a name="ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a name="ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a> : <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.gT"><span class="id" title="variable">gT</span></a>.<br/>
<span class="id" title="keyword">Implicit</span> <span class="id" title="keyword">Type</span> <span class="id" title="var">M</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>.<br/>

<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> := <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.Y"><span class="id" title="variable">Y</span></a> := <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.yG"><span class="id" title="variable">yG</span></a> := <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">^:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.xyG"><span class="id" title="variable">xyG</span></a> := <a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">^:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.My"><span class="id" title="variable">My</span></a> := <a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&lt;&lt;</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.yG"><span class="id" title="variable">yG</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&gt;&gt;</span></a>.<br/>
<span class="id" title="keyword">Let</span> <a name="ExtremalTheory.ExtremalStructure.Mxy"><span class="id" title="variable">Mxy</span></a> := <a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&lt;&lt;</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.xyG"><span class="id" title="variable">xyG</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&gt;&gt;</span></a>.<br/>

<br/>
<span class="id" title="keyword">Theorem</span> <a name="dihedral2_structure"><span class="id" title="lemma">dihedral2_structure</span></a> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#ff5a974c523b8d4c8927273818a26a02"><span class="id" title="notation">&gt;&lt;|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Y"><span class="id" title="variable">Y</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">t</span>, <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">z</span> <span class="id" title="var">t</span>, <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a605acbeae7597f74f5a9b816ed8a717"><span class="id" title="notation">^-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">Phi</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.nilpotent.html#nil_class"><span class="id" title="definition">nil_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">(</span></a><span class="id" title="keyword">∀</span> <span class="id" title="var">k</span>, <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 0 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">Mho</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">^</span></a><a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.yG"><span class="id" title="variable">yG</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#52f608a788da136ac97df132d7055463"><span class="id" title="notation">:|:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.xyG"><span class="id" title="variable">xyG</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">disjoint</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.yG"><span class="id" title="variable">yG</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.xyG"><span class="id" title="variable">xyG</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">]</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">M</span>, <a class="idref" href="mathcomp.solvable.gseries.html#maximal"><span class="id" title="definition">maximal</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#pred3"><span class="id" title="definition">pred3</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">(</span></a>2<a class="idref" href="mathcomp.solvable.abelian.html#bcb4124a3d9b102768b81d5d3006e029"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.abelian.html#bcb4124a3d9b102768b81d5d3006e029"><span class="id" title="notation">abelem</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0fffdc558ce71ab561d36c8a8094dbe5"><span class="id" title="notation">:</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0fffdc558ce71ab561d36c8a8094dbe5"><span class="id" title="notation">Prop</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_q</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">U</span>, <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Theorem</span> <a name="quaternion_structure"><span class="id" title="lemma">quaternion_structure</span></a> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#pprod"><span class="id" title="abbreviation">pprod</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Y"><span class="id" title="variable">Y</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">t</span>, <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 4<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">z</span> <span class="id" title="var">t</span>, <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a605acbeae7597f74f5a9b816ed8a717"><span class="id" title="notation">^-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">Phi</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.nilpotent.html#nil_class"><span class="id" title="definition">nil_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="id" title="keyword">∀</span> <span class="id" title="var">u</span>, <a class="idref" href="mathcomp.solvable.extremal.html#u"><span class="id" title="variable">u</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#u"><span class="id" title="variable">u</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#u"><span class="id" title="variable">u</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
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&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_q</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">U</span>, <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Theorem</span> <a name="semidihedral_structure"><span class="id" title="lemma">semidihedral_structure</span></a> :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">SD_m</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#ff5a974c523b8d4c8927273818a26a02"><span class="id" title="notation">&gt;&lt;|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Y"><span class="id" title="variable">Y</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 4<br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">z</span> <span class="id" title="var">t</span>, <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">Phi</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.r"><span class="id" title="variable">r</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.nilpotent.html#nil_class"><span class="id" title="definition">nil_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#4d70beb460e783df2b7b2ad387c00194"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">H</span>, <a class="idref" href="mathcomp.solvable.gseries.html#maximal"><span class="id" title="definition">maximal</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#H"><span class="id" title="variable">H</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#pred3"><span class="id" title="definition">pred3</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#H"><span class="id" title="variable">H</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#4d70beb460e783df2b7b2ad387c00194"><span class="id" title="notation">]</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_q</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">U</span>, <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure.X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalStructure"><span class="id" title="section">ExtremalStructure</span></a>.<br/>

<br/>
<span class="id" title="keyword">Section</span> <a name="ExtremalTheory.ExtremalClass"><span class="id" title="section">ExtremalClass</span></a>.<br/>

<br/>
<span class="id" title="keyword">Variables</span> (<a name="ExtremalTheory.ExtremalClass.gT"><span class="id" title="variable">gT</span></a> : <a class="idref" href="mathcomp.fingroup.fingroup.html#FinGroup.Exports.finGroupType"><span class="id" title="abbreviation">finGroupType</span></a>) (<a name="ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>).<br/>

<br/>
<span class="id" title="keyword">Inductive</span> <a name="extremal_group_type"><span class="id" title="inductive">extremal_group_type</span></a> :=<br/>
&nbsp;&nbsp;<a name="ModularGroup"><span class="id" title="constructor">ModularGroup</span></a> | <a name="Dihedral"><span class="id" title="constructor">Dihedral</span></a> | <a name="SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> | <a name="Quaternion"><span class="id" title="constructor">Quaternion</span></a> | <a name="NotExtremal"><span class="id" title="constructor">NotExtremal</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="index_extremal_group_type"><span class="id" title="definition">index_extremal_group_type</span></a> <span class="id" title="var">c</span> :=<br/>
&nbsp;&nbsp;<span class="id" title="keyword">match</span> <a class="idref" href="mathcomp.solvable.extremal.html#c"><span class="id" title="variable">c</span></a> <span class="id" title="keyword">with</span><br/>
&nbsp;&nbsp;| <a class="idref" href="mathcomp.solvable.extremal.html#ModularGroup"><span class="id" title="constructor">ModularGroup</span></a> ⇒ 0<br/>
&nbsp;&nbsp;| <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a> ⇒ 1<br/>
&nbsp;&nbsp;| <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> ⇒ 2<br/>
&nbsp;&nbsp;| <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> ⇒ 3<br/>
&nbsp;&nbsp;| <a class="idref" href="mathcomp.solvable.extremal.html#NotExtremal"><span class="id" title="constructor">NotExtremal</span></a> ⇒ 4<br/>
&nbsp;&nbsp;<span class="id" title="keyword">end</span>%<span class="id" title="var">N</span>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="enum_extremal_groups"><span class="id" title="definition">enum_extremal_groups</span></a> :=<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.ssreflect.seq.html#b2d6f6eec274c9f9919a378a42b5b183"><span class="id" title="notation">[::</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ModularGroup"><span class="id" title="constructor">ModularGroup</span></a><a class="idref" href="mathcomp.ssreflect.seq.html#b2d6f6eec274c9f9919a378a42b5b183"><span class="id" title="notation">;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a><a class="idref" href="mathcomp.ssreflect.seq.html#b2d6f6eec274c9f9919a378a42b5b183"><span class="id" title="notation">;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a><a class="idref" href="mathcomp.ssreflect.seq.html#b2d6f6eec274c9f9919a378a42b5b183"><span class="id" title="notation">;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a><a class="idref" href="mathcomp.ssreflect.seq.html#b2d6f6eec274c9f9919a378a42b5b183"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="cancel_index_extremal_groups"><span class="id" title="lemma">cancel_index_extremal_groups</span></a> :<br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrfun.html#cancel"><span class="id" title="definition">cancel</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#index_extremal_group_type"><span class="id" title="definition">index_extremal_group_type</span></a> (<a class="idref" href="mathcomp.ssreflect.seq.html#nth"><span class="id" title="definition">nth</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#NotExtremal"><span class="id" title="constructor">NotExtremal</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#enum_extremal_groups"><span class="id" title="definition">enum_extremal_groups</span></a>).<br/>
 
<br/>
<span class="id" title="keyword">Import</span> <span class="id" title="var">choice</span>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="extremal_group_eqMixin"><span class="id" title="definition">extremal_group_eqMixin</span></a> := <a class="idref" href="mathcomp.ssreflect.eqtype.html#CanEqMixin"><span class="id" title="definition">CanEqMixin</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extgK"><span class="id" title="abbreviation">extgK</span></a>.<br/>
<span class="id" title="keyword">Canonical</span> <span class="id" title="var">extremal_group_eqType</span> := <a class="idref" href="mathcomp.ssreflect.eqtype.html#Equality.Exports.EqType"><span class="id" title="abbreviation">EqType</span></a> <span class="id" title="var">_</span> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_group_eqMixin"><span class="id" title="definition">extremal_group_eqMixin</span></a>.<br/>
<span class="id" title="keyword">Definition</span> <a name="extremal_group_choiceMixin"><span class="id" title="definition">extremal_group_choiceMixin</span></a> := <a class="idref" href="mathcomp.ssreflect.choice.html#CanChoiceMixin"><span class="id" title="definition">CanChoiceMixin</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extgK"><span class="id" title="abbreviation">extgK</span></a>.<br/>
<span class="id" title="keyword">Canonical</span> <span class="id" title="var">extremal_group_choiceType</span> := <a class="idref" href="mathcomp.ssreflect.choice.html#Choice.Exports.ChoiceType"><span class="id" title="abbreviation">ChoiceType</span></a> <span class="id" title="var">_</span> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_group_choiceMixin"><span class="id" title="definition">extremal_group_choiceMixin</span></a>.<br/>
<span class="id" title="keyword">Definition</span> <a name="extremal_group_countMixin"><span class="id" title="definition">extremal_group_countMixin</span></a> := <a class="idref" href="mathcomp.ssreflect.choice.html#CanCountMixin"><span class="id" title="definition">CanCountMixin</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extgK"><span class="id" title="abbreviation">extgK</span></a>.<br/>
<span class="id" title="keyword">Canonical</span> <span class="id" title="var">extremal_group_countType</span> := <a class="idref" href="mathcomp.ssreflect.choice.html#Countable.Exports.CountType"><span class="id" title="abbreviation">CountType</span></a> <span class="id" title="var">_</span> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_group_countMixin"><span class="id" title="definition">extremal_group_countMixin</span></a>.<br/>
<span class="id" title="keyword">Lemma</span> <a name="bound_extremal_groups"><span class="id" title="lemma">bound_extremal_groups</span></a> (<span class="id" title="var">c</span> : <a class="idref" href="mathcomp.solvable.extremal.html#extremal_group_type"><span class="id" title="inductive">extremal_group_type</span></a>) : <a class="idref" href="mathcomp.ssreflect.choice.html#pickle"><span class="id" title="definition">pickle</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#c"><span class="id" title="variable">c</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#989c98e7ddd65d5bf37c334ff2076de8"><span class="id" title="notation">&lt;</span></a> 6.<br/>
 <span class="id" title="keyword">Definition</span> <a name="extremal_group_finMixin"><span class="id" title="definition">extremal_group_finMixin</span></a> := <a class="idref" href="mathcomp.ssreflect.fintype.html#Finite.CountMixin"><span class="id" title="definition">Finite.CountMixin</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#bound_extremal_groups"><span class="id" title="lemma">bound_extremal_groups</span></a>.<br/>
<span class="id" title="keyword">Canonical</span> <span class="id" title="var">extremal_group_finType</span> := <a class="idref" href="mathcomp.ssreflect.fintype.html#Finite.Exports.FinType"><span class="id" title="abbreviation">FinType</span></a> <span class="id" title="var">_</span> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_group_finMixin"><span class="id" title="definition">extremal_group_finMixin</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="extremal_class"><span class="id" title="definition">extremal_class</span></a> (<span class="id" title="var">A</span> : <a class="idref" href="mathcomp.ssreflect.finset.html#0fec877de6d09ef39abb9b599a84eb0e"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#0fec877de6d09ef39abb9b599a84eb0e"><span class="id" title="notation">set</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.ssreflect.finset.html#0fec877de6d09ef39abb9b599a84eb0e"><span class="id" title="notation">}</span></a>) :=<br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">m</span> := <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">p</span> := <a class="idref" href="mathcomp.ssreflect.prime.html#pdiv"><span class="id" title="definition">pdiv</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">n</span> := <a class="idref" href="mathcomp.ssreflect.prime.html#logn"><span class="id" title="definition">logn</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#m"><span class="id" title="variable">m</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">SD_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ModularGroup"><span class="id" title="constructor">ModularGroup</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#NotExtremal"><span class="id" title="constructor">NotExtremal</span></a>.<br/>

<br/>
<span class="id" title="keyword">Definition</span> <a name="extremal2"><span class="id" title="definition">extremal2</span></a> <span class="id" title="var">A</span> := <a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#A"><span class="id" title="variable">A</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.ssreflect.seq.html#behead"><span class="id" title="definition">behead</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#enum_extremal_groups"><span class="id" title="definition">enum_extremal_groups</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="dihedral_classP"><span class="id" title="lemma">dihedral_classP</span></a> :<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">↔</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">n</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="quaternion_classP"><span class="id" title="lemma">quaternion_classP</span></a> :<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">↔</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">n</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="semidihedral_classP"><span class="id" title="lemma">semidihedral_classP</span></a> :<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">↔</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">n</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">SD_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#622744278f4dd42603c699fb184123e7"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="odd_not_extremal2"><span class="id" title="lemma">odd_not_extremal2</span></a> : <a class="idref" href="mathcomp.ssreflect.ssrnat.html#odd"><span class="id" title="definition">odd</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#4b80c70cdb231351c5e129ba61f7f956"><span class="id" title="notation">~~</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal2"><span class="id" title="definition">extremal2</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a>.<br/>

<br/>
<span class="id" title="keyword">Lemma</span> <a name="modular_group_classP"><span class="id" title="lemma">modular_group_classP</span></a> :<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ModularGroup"><span class="id" title="constructor">ModularGroup</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">↔</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">p</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.prime.html#prime"><span class="id" title="definition">prime</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">n</span><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#08fe8636f4b45ae6787c490d19de1366"><span class="id" title="notation">≥</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#b3eea360671e1b32b18a26e15b3aace3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 2<a class="idref" href="mathcomp.ssreflect.ssrnat.html#b3eea360671e1b32b18a26e15b3aace3"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#b3eea360671e1b32b18a26e15b3aace3"><span class="id" title="notation">+</span></a> 3 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#28b18e493f7cb0bd8447607bdc385ff8"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass.G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">Mod_</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cde820eeae6e659d7da1ef2161ef68ea"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#df1ced36fc33ce188051218bca314374"><span class="id" title="notation">)</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory.ExtremalClass"><span class="id" title="section">ExtremalClass</span></a>.<br/>

<br/>
<span class="id" title="keyword">Theorem</span> <a name="extremal2_structure"><span class="id" title="lemma">extremal2_structure</span></a> (<span class="id" title="var">gT</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#FinGroup.Exports.finGroupType"><span class="id" title="abbreviation">finGroupType</span></a>) (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) <span class="id" title="var">n</span> <span class="id" title="var">x</span> <span class="id" title="var">y</span> :<br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">cG</span> := <a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">m</span> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a>)%<span class="id" title="var">N</span> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">q</span> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a>)%<span class="id" title="var">N</span> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">r</span> := (2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#b870774a3786e6850cf468108b4e1ee5"><span class="id" title="notation">.-2</span></a>)%<span class="id" title="var">N</span> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">X</span> := <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">yG</span> := <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">^:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">xyG</span> := <a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30988ee242f08216f4b40cf90b42b816"><span class="id" title="notation">^:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;<span class="id" title="keyword">let</span> <span class="id" title="var">My</span> := <a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&lt;&lt;</span></a><a class="idref" href="mathcomp.solvable.extremal.html#yG"><span class="id" title="variable">yG</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&gt;&gt;</span></a> <span class="id" title="tactic">in</span> <span class="id" title="keyword">let</span> <span class="id" title="var">Mxy</span> := <a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&lt;&lt;</span></a><a class="idref" href="mathcomp.solvable.extremal.html#xyG"><span class="id" title="variable">xyG</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#d2263119ac2870c795428c0a326d9d52"><span class="id" title="notation">&gt;&gt;</span></a> <span class="id" title="tactic">in</span><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_generators"><span class="id" title="definition">extremal_generators</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> 2 <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#44400027531d4bc3f586a1997dc874c0"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal2"><span class="id" title="definition">extremal2</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#3b17cb5f3a16fa64a62421f68786f750"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#3b17cb5f3a16fa64a62421f68786f750"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#3b17cb5f3a16fa64a62421f68786f750"><span class="id" title="notation">==&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#3b17cb5f3a16fa64a62421f68786f750"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#3b17cb5f3a16fa64a62421f68786f750"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#pprod"><span class="id" title="abbreviation">pprod</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#ff5a974c523b8d4c8927273818a26a02"><span class="id" title="notation">&gt;&lt;|</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#169fb610eeaa28cebf8ec36928167473"><span class="id" title="notation">×</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#y"><span class="id" title="variable">y</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 4 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">z</span>, <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> 4<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#b1eeadc2feabc7422252baa895418c7b"><span class="id" title="notation">!=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#True"><span class="id" title="inductive">True</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">z</span>, <a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">#[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#89402f0d9375903caa99ad84144160d5"><span class="id" title="notation">]</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#r"><span class="id" title="variable">r</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#5c59b35a0b51db520cf1fba473ecf127"><span class="id" title="notation">}</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">{</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">,</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">t</span> <span class="id" title="var">z</span>,<br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#808c6b8e35e792f23899f360a21e4638"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#z"><span class="id" title="variable">z</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#t"><span class="id" title="variable">t</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#a605acbeae7597f74f5a9b816ed8a717"><span class="id" title="notation">^-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#208bc995000a6307bdbc043c43919d97"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> 2<a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">Phi</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.maximal.html#667f66888ea7f77714c03ac542d07e87"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">^`(</span></a>1<a class="idref" href="mathcomp.solvable.commutator.html#2af6d4df4fd579da0e206aeed0c82e74"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#r"><span class="id" title="variable">r</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.nilpotent.html#nil_class"><span class="id" title="definition">nil_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#1d63841e595f2805afd872744cbb1cce"><span class="id" title="notation">.-1</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">[/\</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d82a7d96d3659d805ffe732283716822"><span class="id" title="notation">∧</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> 2<a class="idref" href="mathcomp.solvable.abelian.html#bcb4124a3d9b102768b81d5d3006e029"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.abelian.html#bcb4124a3d9b102768b81d5d3006e029"><span class="id" title="notation">abelem</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#r"><span class="id" title="variable">r</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#SemiDihedral"><span class="id" title="constructor">SemiDihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#My"><span class="id" title="variable">My</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_2</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">k</span>, <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#19ab5cfd7e4f60fa14f22b576013bd96"><span class="id" title="notation">&gt;</span></a> 0 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">Mho</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">^</span></a><a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">&lt;[</span></a><a class="idref" href="mathcomp.solvable.extremal.html#x"><span class="id" title="variable">x</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">^+</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">(</span></a>2 <a class="idref" href="mathcomp.ssreflect.ssrnat.html#4c362bcf0e947e2792a2e6989b44aeb0"><span class="id" title="notation">^</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#k"><span class="id" title="variable">k</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#86a04fb564fb97d388cad84a3a204260"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#30152704c0ab4066186d0284456667e8"><span class="id" title="notation">]&gt;</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#ca13a32469ebe56c9f4cc99d00e8eeba"><span class="id" title="notation">]</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#yG"><span class="id" title="variable">yG</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#52f608a788da136ac97df132d7055463"><span class="id" title="notation">:|:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xyG"><span class="id" title="variable">xyG</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#1db838ba797020f3b39c07ed7167bc93"><span class="id" title="notation">:\:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">[</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">disjoint</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#yG"><span class="id" title="variable">yG</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#xyG"><span class="id" title="variable">xyG</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#fca367ac88276c4c83db3cc7c637993a"><span class="id" title="notation">]</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">H</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>, <a class="idref" href="mathcomp.solvable.gseries.html#maximal"><span class="id" title="definition">maximal</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#H"><span class="id" title="variable">H</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#gval"><span class="id" title="projection">gval</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#H"><span class="id" title="variable">H</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#pred3"><span class="id" title="definition">pred3</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Mxy"><span class="id" title="variable">Mxy</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><br/>
&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#n"><span class="id" title="variable">n</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#9b077c369e19739ef880736ba34623ff"><span class="id" title="notation">≤</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#b3eea360671e1b32b18a26e15b3aace3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a><a class="idref" href="mathcomp.ssreflect.ssrnat.html#b3eea360671e1b32b18a26e15b3aace3"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#b3eea360671e1b32b18a26e15b3aace3"><span class="id" title="notation">+</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#True"><span class="id" title="inductive">True</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <span class="id" title="keyword">∀</span> <span class="id" title="var">U</span>, <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_q</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#My"><span class="id" title="variable">My</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_q</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#My"><span class="id" title="variable">My</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#114753a05fa1a4c728fd6c58cce9f74c"><span class="id" title="notation">D_q</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_q</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Mxy"><span class="id" title="variable">Mxy</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">if</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Dihedral"><span class="id" title="constructor">Dihedral</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">then</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#cG"><span class="id" title="variable">cG</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssreflect.html#0348819abaa88c2cd747e8fa60dde7ae"><span class="id" title="notation">else</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]]</span></a>.<br/>

<br/>
</div>

<div class="doc">
 This is Aschbacher (23.4).   
</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="maximal_cycle_extremal"><span class="id" title="lemma">maximal_cycle_extremal</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> <span class="id" title="var">X</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#4b80c70cdb231351c5e129ba61f7f956"><span class="id" title="notation">~~</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#abelian"><span class="id" title="definition">abelian</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#826eae8d7598a787ea56f4249e6e210e"><span class="id" title="notation">subset</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ModularGroup"><span class="id" title="constructor">ModularGroup</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">||</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal2"><span class="id" title="definition">extremal2</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a>.<br/>

<br/>
</div>

<div class="doc">
 This is Aschbacher (23.5)  
</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="cyclic_SCN"><span class="id" title="lemma">cyclic_SCN</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> <span class="id" title="var">U</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#26f8a21baf152231d1021a44ff5e4898"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.maximal.html#26f8a21baf152231d1021a44ff5e4898"><span class="id" title="notation">SCN</span></a><a class="idref" href="mathcomp.solvable.maximal.html#26f8a21baf152231d1021a44ff5e4898"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.maximal.html#26f8a21baf152231d1021a44ff5e4898"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#4b80c70cdb231351c5e129ba61f7f956"><span class="id" title="notation">~~</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#abelian"><span class="id" title="definition">abelian</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal2"><span class="id" title="definition">extremal2</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a><br/>
<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#7a45dffb109c3069e5c675be68643e60"><span class="id" title="notation">∨</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">∃</span></a> <span class="id" title="var">M</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#67291ec55239f54fa5aa0b0bb974446c"><span class="id" title="notation">:=:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#507fd39a15bb9cb7e52e1aaa9e2285b5"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#507fd39a15bb9cb7e52e1aaa9e2285b5"><span class="id" title="notation">C_G</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#507fd39a15bb9cb7e52e1aaa9e2285b5"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">Mho</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">^</span></a>1<a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c11ffdc20a90dd3221cf1b1401ec4b7f"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#507fd39a15bb9cb7e52e1aaa9e2285b5"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#U"><span class="id" title="variable">U</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#f65ecb5148d1ef5a9c551827b20e9bfa"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#ModularGroup"><span class="id" title="constructor">ModularGroup</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.abelian.html#8ce10e5a865533ba61bc29dbd4d1570c"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#8ce10e5a865533ba61bc29dbd4d1570c"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#8ce10e5a865533ba61bc29dbd4d1570c"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a><a class="idref" href="mathcomp.solvable.abelian.html#8ce10e5a865533ba61bc29dbd4d1570c"><span class="id" title="notation">)</span></a>%<span class="id" title="var">G</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">\</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#46c9e8232fa09401e24f1934bb65029f"><span class="id" title="notation">in</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#1b851bcf821e0c155d9765a6ddd2e288"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#1b851bcf821e0c155d9765a6ddd2e288"><span class="id" title="notation">E_p</span></a><a class="idref" href="mathcomp.solvable.abelian.html#1b851bcf821e0c155d9765a6ddd2e288"><span class="id" title="notation">^</span></a>2<a class="idref" href="mathcomp.solvable.abelian.html#1b851bcf821e0c155d9765a6ddd2e288"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#1b851bcf821e0c155d9765a6ddd2e288"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#M"><span class="id" title="variable">M</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.fingroup.automorphism.html#004858100bfba9714bde1cdbce60358b"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.automorphism.html#004858100bfba9714bde1cdbce60358b"><span class="id" title="notation">char</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#c7fe7fb0f694e91a7e258ff78a0390ef"><span class="id" title="notation">]</span></a>.<br/>

<br/>
</div>

<div class="doc">
 This is Aschbacher, exercise (8.4)  
</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="normal_rank1_structure"><span class="id" title="lemma">normal_rank1_structure</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">(</span></a><span class="id" title="keyword">∀</span> <span class="id" title="var">X</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>, <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#c27c638e534bbb5b7de2d4b4aa0a3e82"><span class="id" title="notation">&lt;|</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#abelian"><span class="id" title="definition">abelian</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#7a45dffb109c3069e5c675be68643e60"><span class="id" title="notation">∨</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2e9317c5f71a1305fb695cdc49716482"><span class="id" title="notation">[&amp;&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2e9317c5f71a1305fb695cdc49716482"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal2"><span class="id" title="definition">extremal2</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2e9317c5f71a1305fb695cdc49716482"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#08fe8636f4b45ae6787c490d19de1366"><span class="id" title="notation">≥</span></a> 16<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">||</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.morphism.html#cec6c3028572f2d4d267ecf02dc64058"><span class="id" title="notation">isog</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.extremal.html#7a3ab294f809847ed7e277c085de5f5d"><span class="id" title="notation">Q_8</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#2e9317c5f71a1305fb695cdc49716482"><span class="id" title="notation">]</span></a>.<br/>

<br/>
</div>

<div class="doc">
 Replacement for Section 4 proof.  
</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="odd_pgroup_rank1_cyclic"><span class="id" title="lemma">odd_pgroup_rank1_cyclic</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#odd"><span class="id" title="definition">odd</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.abelian.html#2e018390d4609ecf460bceadff549bb3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#2e018390d4609ecf460bceadff549bb3"><span class="id" title="notation">r_p</span></a><a class="idref" href="mathcomp.solvable.abelian.html#2e018390d4609ecf460bceadff549bb3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#2e018390d4609ecf460bceadff549bb3"><span class="id" title="notation">)</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#9b077c369e19739ef880736ba34623ff"><span class="id" title="notation">≤</span></a> 1<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">)</span></a>.<br/>

<br/>
</div>

<div class="doc">
 This is the second part of Aschbacher, exercise (8.4).  
</div>
<div class="code">
<span class="id" title="keyword">Lemma</span> <a name="prime_Ohm1P"><span class="id" title="lemma">prime_Ohm1P</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#36625695d37b6869c156bfcdf13834f7"><span class="id" title="notation">:!=:</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#reflect"><span class="id" title="abbreviation">reflect</span></a> (<a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">Ohm_1</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><a class="idref" href="mathcomp.solvable.abelian.html#c300ec465942bb74c9d0df0e983eeb01"><span class="id" title="notation">)</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a>)<br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(<a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#14a7a9c7dc61f86bfb664d400fabaf8a"><span class="id" title="notation">||</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">&amp;&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#extremal_class"><span class="id" title="definition">extremal_class</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="mathcomp.ssreflect.eqtype.html#17d28d004d0863cb022d4ce832ddaaae"><span class="id" title="notation">==</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#Quaternion"><span class="id" title="constructor">Quaternion</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Datatypes.html#49ac24efa716d8b0ee8943bc1d1769a9"><span class="id" title="notation">)</span></a>).<br/>

<br/>
</div>

<div class="doc">
 This is Aschbacher (23.9)  
</div>
<div class="code">
<span class="id" title="keyword">Theorem</span> <a name="symplectic_type_group_structure"><span class="id" title="lemma">symplectic_type_group_structure</span></a> <span class="id" title="var">gT</span> <span class="id" title="var">p</span> (<span class="id" title="var">G</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>) :<br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">.-</span></a><a class="idref" href="mathcomp.solvable.pgroup.html#5b9c9ef075a2fca9df30ee4ac4a1af18"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">(</span></a><span class="id" title="keyword">∀</span> <span class="id" title="var">X</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a>, <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="mathcomp.fingroup.automorphism.html#004858100bfba9714bde1cdbce60358b"><span class="id" title="notation">\</span></a><a class="idref" href="mathcomp.fingroup.automorphism.html#004858100bfba9714bde1cdbce60358b"><span class="id" title="notation">char</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#abelian"><span class="id" title="definition">abelian</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#X"><span class="id" title="variable">X</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">)</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#d43e996736952df71ebeeae74d10a287"><span class="id" title="notation">→</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#fe60c20831f772c0c3c288abf68cc42a"><span class="id" title="notation">exists2</span></a> <span class="id" title="var">E</span> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#fe60c20831f772c0c3c288abf68cc42a"><span class="id" title="notation">:</span></a> <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#fe60c20831f772c0c3c288abf68cc42a"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#E"><span class="id" title="variable">E</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#67291ec55239f54fa5aa0b0bb974446c"><span class="id" title="notation">:=:</span></a> 1 <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#7a45dffb109c3069e5c675be68643e60"><span class="id" title="notation">∨</span></a> <a class="idref" href="mathcomp.solvable.maximal.html#extraspecial"><span class="id" title="definition">extraspecial</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#E"><span class="id" title="variable">E</span></a><br/>
&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#fe60c20831f772c0c3c288abf68cc42a"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">∃</span></a> <span class="id" title="var">R</span> : <a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">{</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">group</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#gT"><span class="id" title="variable">gT</span></a><a class="idref" href="mathcomp.fingroup.fingroup.html#ab072eb546972c7e5cdaf33b8a35ce6b"><span class="id" title="notation">}</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#84eb6d2849dbf3581b1c0c05add5f2d8"><span class="id" title="notation">,</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.cyclic.html#cyclic"><span class="id" title="definition">cyclic</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#R"><span class="id" title="variable">R</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#7a45dffb109c3069e5c675be68643e60"><span class="id" title="notation">∨</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">[/\</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#p"><span class="id" title="variable">p</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> 2<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">,</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#extremal2"><span class="id" title="definition">extremal2</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#R"><span class="id" title="variable">R</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">#|</span></a><a class="idref" href="mathcomp.solvable.extremal.html#R"><span class="id" title="variable">R</span></a><a class="idref" href="mathcomp.ssreflect.fintype.html#f01714bb99e6c7abc6cfb2e43eff7f6e"><span class="id" title="notation">|</span></a> <a class="idref" href="mathcomp.ssreflect.ssrnat.html#08fe8636f4b45ae6787c490d19de1366"><span class="id" title="notation">≥</span></a> 16<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">],</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="mathcomp.solvable.extremal.html#E"><span class="id" title="variable">E</span></a> <a class="idref" href="mathcomp.fingroup.gproduct.html#9607c0b7b0a7e59f4327b220d5a93330"><span class="id" title="notation">\*</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#R"><span class="id" title="variable">R</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#G"><span class="id" title="variable">G</span></a><br/>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">&amp;</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#E"><span class="id" title="variable">E</span></a> <a class="idref" href="mathcomp.ssreflect.finset.html#cb41714a5a23482f7a48a98975fa8c59"><span class="id" title="notation">:&amp;:</span></a> <a class="idref" href="mathcomp.solvable.extremal.html#R"><span class="id" title="variable">R</span></a> <a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.Init.Logic.html#1c39bf18749e5cc609e83c0a0ba5a372"><span class="id" title="notation">=</span></a> <a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">'</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">Z</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">(</span></a><a class="idref" href="mathcomp.solvable.extremal.html#E"><span class="id" title="variable">E</span></a><a class="idref" href="mathcomp.solvable.center.html#07d637974acf808c1caadc3b5bdfa6d3"><span class="id" title="notation">)</span></a><a class="idref" href="http://coq.inria.fr/distrib/8.8.0/stdlib//Coq.ssr.ssrbool.html#962a3cb7af009aedac7986e261646bd1"><span class="id" title="notation">]</span></a>.<br/>

<br/>
<span class="id" title="keyword">End</span> <a class="idref" href="mathcomp.solvable.extremal.html#ExtremalTheory"><span class="id" title="section">ExtremalTheory</span></a>.<br/>
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