Main scientific works are connected with investigations
on the movement stability theory in mechanical systems,
the theory of equilibrium figures in rotated fluid,
mathematical physics and probability theory.
He had been an academician in St. Petersburg academy.
In 1969 Soviet academy of science instituted
the gold medal named by A. M. Lyapunov.
Alexander M. Lyapunov was born on June 6 (by old chronology)
1857 in Yaroslavl.
In 1880 he graduated from St. Petersburg University.
Since 1885 year A. M. Lyapunov is a professor
assistant and since 1892 - professor of Kharkov university.
In 1902 he defended a doctoral thesis and passed on job
St. Petersburg academy of science.
The Lyapunov's doctoral thesis
"The general problems of motion stability"
was dedicated to stability research of mechanical systems
with final number of degrees of freedom.
There were published his fundamental results on stability
of mechanical systems which formed the basis of modern theory
This work made enormous influence on development of mechanics
and qualitative theory of ordinary differential equations.
Being the outstanding follower of P. L. Chebyshev,
M. A. Lyapunov continued and developed ideas
of his teacher in different areas of mechanics.
He has received great results on research in the equilibrium
forms of a rotated liquid, on a theory of potential,
on a method of characteristic functions for the proof
of limit theorems of probability theory.