Question: Lazar Lyusternik and Israel Gelfand, have which mutual occupation?
Sentence (from "Lazar Lyusternik"): Lazar Aronovich Lyusternik (also Lusternik, Lusternick, Ljusternik; Ла́зарь Аро́нович Люсте́рник ; 31 December 1899, Zduńska Wola, Congress Poland, Russian Empire (present-day Republic of Poland) – 23 July 1981, Moscow, Russia, Soviet Union) was a Soviet mathematician.
Relevant evidence: Yes