Aleksandr Mikhailovich Lyapunov (Александр Михайлович Ляпунов) (June 6, 1857 – November 3, 1918, all new style) was a Russian mathematician, mechanician and physicist. Sometimes his name is also written as Ljapunov, Liapunov or Ljapunow, and often improperly pronounced 'la-yapunov'.

Teaching and research

Lyapunov's central limit theorem,
Lyapunov's condition,
Lyapunov's characteristic number—see Lyapunov exponent,
Lyapunov equation,
Lyapunov exponent,
Lyapunov fractal,
Lyapunov function,
Lyapunov stability,
Lyapunov test,
Lyapunov time,
Lyapunov tube.