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.
Leonid Kurchevsky Leonid Vasilyevich Kurchevsky (Russian: Леонид Васильевич Курчевский ) (September 22, 1890, Pereslavl-Zalessky – November 26, 1937 (January 12, 1939?)) was a Russian/Soviet weapons designer.