quartic reciprocity
... that quartic reciprocity was first conjectured by Swiss mathematician Euler in 1748–1750, but not proved until 1836–37 by Prussian mathematician Jacobi?
... that <b id="mwEMY"><a href="./Quartic_reciprocity" id="mwEMc" rel="mw:WikiLink" title="Quartic reciprocity">quartic reciprocity</a></b> was first <a href="./Conjecture" id="mwEMg" rel="mw:WikiLink" title="Conjecture">conjectured</a> by <a class="mw-redirect" href="./Swiss_(people)" id="mwEMk" rel="mw:WikiLink" title="Swiss (people)">Swiss</a> <a href="./Mathematician" id="mwEMo" rel="mw:WikiLink" title="Mathematician">mathematician</a> <a href="./Leonhard_Euler" id="mwEMs" rel="mw:WikiLink" title="Leonhard Euler">Euler</a> in 1748–1750, but not proved until 1836–37 by <a href="./Prussia" id="mwEMw" rel="mw:WikiLink" title="Prussia">Prussian</a> mathematician <a href="./Carl_Gustav_Jacob_Jacobi" id="mwEM0" rel="mw:WikiLink" title="Carl Gustav Jacob Jacobi">Jacobi</a>?