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Pavel Korovkin
Pavel Petrovich Korovkin ((ロシア語:Павел Петрович Коровкин)) (the family name is also transliterated as Korowkin in German sources), (9 July 1913 – 11 August 1985) was a Soviet and Russian mathematician whose main fields of research were orthogonal polynomials, approximation theory and potential theory. In 1947 he proved a generalization of Egorov's theorem:〔In the paper . See also the two biographical papers by Nikol'skii, Privalov and Ul'yanov (, p. 180; , p. 156).〕 from the early 1950s on, his research interests turned to functional analysis and he examined the stability of the exterior Dirichlet problem and the convergence and approximation properties of linear positive operators on spaces of continuous functions. The set of terms and Korovkin approximation are named after him.
==Life and career==
Korovkin was born to a poor peasant family. He lost his father early and grew from 1914 to 1920 at a children's home. In 1930 he finished the school in Leningrad and was the winner of a mathematics competition the right to take the entrance exam without studying at the Faculty of Mathematics and Mechanics of the Leningrad State University, which he made after a year of work use. He studied with V.I. Smirnov and earned his doctorate in 1939 with a dissertation on orthogonal polynomials. He then was appointed to Kalinin State University.
At the beginning of Great Patriotic War, Korovkin volunteered and began a military career.
In December 1945, he continued his work at the Kalinin Pedagogical Institute, in 1947 with a thesis on convergence of polynomial sequences, and was appointed professor in 1948. At the Moscow Automobile and Road Institute from 1958 to 1970 he headed the department of higher mathematics, then he became head of the Department of Mathematical Analysis at the Tsiolkovsky State University in Kaluga.
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