# m_t

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 215 Awfully sophisticated proof for simple facts 18 Commutator subgroup does not consist only of commutators? 12 What is the categorical significance of the trivial $\mathfrak{g}$-module in the category of $\mathfrak{g}$-mod? 10 Is there a version of inclusion/exclusion for vector spaces? 9 “Lie algebra” for a general group ?

# 1,269 Reputation

 +10 Commutator subgroup does not consist only of commutators? +10 Is the universal enveloping algebra of a finite-dimensional Lie algebra (left) noetherian? +2 LU decomposition +10 What is the categorical significance of the trivial $\mathfrak{g}$-module in the category of $\mathfrak{g}$-mod?

# 4 Questions

 14 Bruhat order and the Robinson-Schensted correspondence 9 ultrapowers and higher order logic 8 Simple modules for $U_q(\mathfrak{sl}_n)$ at roots of unity 2 Branching rule for classical Lie algebras in positive characteristic

# 42 Tags

 38 rt.representation-theory × 9 12 modules 37 gr.group-theory × 4 12 ct.category-theory 19 ra.rings-and-algebras × 3 8 finite-groups × 2 16 linear-algebra × 2 6 induced-representations 12 lie-algebras × 3 5 hopf-algebras

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 MathOverflow 1,269 rep 2818
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