Aleksandr Mikhailovich Lyapunov was a Russian mathematician, mechanician and physicist. His surname is variously romanized as Ljapunov, Liapunov, Liapounoff or Ljapunow. He was the son of the astronomer Mikhail Lyapunov and the brother of the pianist and composer Sergei Lyapunov.
Aleksandr Lyapunov
Aleksandr Lyapunov in 1908
Sergei Mikhailovich Lyapunov was a Russian composer, pianist and conductor.
Sergei Lyapunov
Conductor Hans Winderstein (far left), Sergei Lyapunov, pianist Ricardo Viñes (standing) and publisher Julius Heinrich Zimmermann (far right) in Leipzig in 1907.
Lyapunov recording for the Welte-Mignon reproducing piano in St. Petersburg or Moscow in January 1910.
Lyapunov's grave in Paris.