Question: Aleksandr Lyapunov and Israel Gelfand, share which mutual occupation?
Sentence (from "Aleksandr Lyapunov"): Aleksandr Mikhailovich Lyapunov (Russian: Алекса́ндр Миха́йлович Ляпуно́в , ] ; June 6 [O.S. May 25] 1857 – November 3, 1918) was a Russian mathematician, mechanician and physicist.
Relevant evidence: Yes