Sergei Nikolaevich Chernikov
... that mathematician Sergei Nikolaevich Chernikov already had the first of his five department chairs before defending his DSc in 1940?
... that mathematician <b id="mwAvI"><a class="mw-redirect" href="./Sergei_Nikolaevich_Chernikov" id="mwAvM" rel="mw:WikiLink" title="Sergei Nikolaevich Chernikov">Sergei Nikolaevich Chernikov</a></b> already had the first of his five department chairs before defending his <a class="mw-redirect" href="./Doktor_nauk" id="mwAvQ" rel="mw:WikiLink" title="Doktor nauk">DSc</a> in 1940?