Background
He was born at a Tserukha village in Gomel region.
He was born at a Tserukha village in Gomel region.
After graduating Kiev University at 1868 he was set there to prepare for becoming a professor of mathematics. In 1870 he opened a new and an interesting criterion for convergence of infinite series and published that in his articles "General theory of criterion for convergence of series " (1870), "A new criterion for convergence and divergence of infinite series of constant sign" (1872). In 1871 he was sent for academic affairs abroad. In 1874 he defended master's thesis , in 1879 - doctoral thesis ("Integration of differential equations of mechanics") and was appointed to be a professor of Kiev University. In 1844 he was elected as a corresponding member of St.-Petersburg Academy of Science. He is the author of numerous works
in mathematics, which were published in periodicals. In calculus of variations he expressed a thought about the necessity of a research of the increment of an integral. He is one of the coordinators of physic-mathematical society (1899). He published "The Journal of Elementary Mathematics" (1884-86). Opened a new and an interesting criterion for convergence of infinite series, expressed a thought about the necessity of a research of the increment of an integral.