academician aleksandr korkin alma mater analytical mechanics applied mathematics astronomer astronomy celestial mechanics central limit theorem chemistry differential equation dipole electric charge ethnography french language german language history integral johann peter gustav lejeune dirichlet kazan state university kharkov mathematical society kinematics leonhard euler literature lyapunov equation lyapunov exponent lyapunov fractal lyapunov function lyapunov stability lyapunov time lyceum mactutor history of mathematics archive mathematical physics mathematician mathematics mathematics genealogy project mechanician mikhail lyapunov moscow nizhny novgorod observatory odessa philosophy physicist political economy potential potential theory probability probability theory romanization of russian rome russia russian academy of sciences russian language russians saint petersburg state university stability stability theory tsagi ukraine ulyanovsk oblast yaroslavl yegor ivanovich zolotarev