Were Maxim Kontsevich and Aleksandr Lyapunov both mathematicians?
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. His surname is sometimes romanized as Ljapunov, Liapunov, Liapounoff or Ljapunow. He was the son of astronomer Mikhail Lyapunov and the brother of pianist and composer Sergei Lyapunov.
Alexander Kasyanov Aleksandr Aleksandrovich Kasyanov (Александр Александрович Касьянов; 17 August 1891 - Gorki 13 February 1982) was a Soviet Russian composer, conductor, pianist and professor. He received the Order of Lenin in 1967, Order of the October Revolution 1981, and People's Artist of the USSR 1971.