PERSONAGE IN SCIENCE Professor V . I . Zubov to the 80 th Birthday Anniversary

Vladimir Ivanovich Zubov was born on April 14, 1930 in the town of Kashira, Moscow region, Russia. In 1945 he finished a secondary school. At the age of 14, Vladimir suffered in the explosion accident happened when he and his playfellows found a hand grenade. His eyes were injured and he failed eyesight soon. In 1949 he finished the Leningrad special school for blind and visually impaired children being the winner of the 15th Leningrad mathematical Olympiad for graduates. The same year he entered the Mathematical and Mechanical Faculty of the Leningrad State University. In 1953 he graduated from the university with honors and received his MSc degree in Mathematics. In the same year he began his post-graduate studies. Zubov was an active participant of the seminar held under the supervision of Professor N. P. Erugin at the Department of Differential and Integral Equations of the Leningrad State University. When discussing the state of the theory of motion stability N. P. Erugin formulated a set of problems requiring constructive solutions. In particular, very important problems were those of the Lyapunov theorems inversion and representation of the general solution for the differential equations system in the asymptotic stability region. V. I. Zubov obtained a number of profound results in these directions which laid the foundation to his PhD thesis titled “Boundaries of the Asymptotic Stability Region” defended in 1955 (with N. P. Erugin as an advisor and professors E.A. Barbashin and N. N. Krasovskij as official opponents). In December 1955 Zubov joined the Institute of Mathematics and Mechanics of the Leningrad State University as a leading researcher.