Abstract:
Nicholas Vladimirovich Efimov is a Corresponding Member of Academy of Sciences of USSR, the author of a hundred scientific articles and of almost dozen textbooks edited in more than two million copies and awarded for this by Gold Medal of VDNKh (1973). He is recognized as one of creators of modern geometry named now as geometry in whole or global geometry. Nicholas Vladimirovich has established the existence of such a phenomenon as the local non-bendability of surfaces and for the discovery he received Lobachevsky's prime (1950) of Academy of Sciences. Then he begun to study the problem of extending of a Hilbert's theorem on non-existence in $R^3$ of a complete surface realizing Lobachevsky's to the case of complete surfaces with strongly negative curvature and after many years of hard word he succeed to prove this result for which he was awarded in 1966 by Lenin prime. This his result has obtained the high estimation of mathematical community on the World Mathematical International Congress in Moscow (1966).
As to the pedagogical activity of Nicholas Vladimirovih we can say that in it there was a very strong human part. As his daughter has wrote, "my father was essentially enlightener". About this part of his pure soul one should remember and take care to keep in memory of future generations.
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