Nikolai Vladimirovich Yefimov (russian: Никола́й Влади́мирович Ефи́мов; 31 May 1910 in

Orenburg Orenburg (russian: Оренбу́рг, ), formerly known as Chkalov (1938–1957), is the administrative center of Orenburg Oblast, Russia. It lies on the Ural River, southeast of Moscow. Orenburg is also very close to the Kazakhstan-Russia bor ...

– 14 August 1982 in

Moscow Moscow ( , US chiefly ; rus, links=no, Москва, r=Moskva, p=mɐskˈva, a=Москва.ogg) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 13.0 million ...

) was a Soviet

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

. He is most famous for his work on generalized Hilbert's problem on surfaces of negative

curvature In mathematics, curvature is any of several strongly related concepts in geometry. Intuitively, the curvature is the amount by which a curve deviates from being a straight line, or a surface deviates from being a plane. For curves, the canonic ...

. Yefimov grew up in

Rostov-on-Don Rostov-on-Don ( rus, Ростов-на-Дону, r=Rostov-na-Donu, p=rɐˈstof nə dɐˈnu) is a port city and the administrative centre of Rostov Oblast and the Southern Federal District of Russia. It lies in the southeastern part of the East Eu ...

and graduated from

Rostov State University Southern Federal University (), abbreviated as SFedU () and formerly known as Rostov State University (1957–2006), is a public university in Rostov Oblast, Russia with campuses in Rostov-on-Don and Taganrog. History Southern Federal Unive ...

, where he studied with Morduhai-Boltovskoi. He worked at

Voronezh State University Voronezh State University is one of the main universities in Central Russia, located in the city of Voronezh. The university was established in 1918 by professors evacuated from the University of Tartu in Estonia. The university has 18 faculties ...

from 1934 to 1941. He taught at the Moscow State University since 1946. Aleksei Pogorelov was one of his students there. He received the

Lobachevsky Prize The Lobachevsky Prize, awarded by the Russian Academy of Sciences, and the Lobachevsky Medal, awarded by the Kazan State University, are mathematical awards in honor of Nikolai Ivanovich Lobachevsky. History The Lobachevsky Prize was established ...

in 1951 and Lenin Prize in 1966. He was an invited plenary speaker at the International Congress of Mathematicians in

, 1966. He became a corresponding member of the Academy of Sciences of the Soviet Union in 1979.

References

* A. D. Aleksandrov, S. P. Novikov, A. V. Pogorelov, È. G. Poznyak, P. K. Rashevskiǐ, È. R. Rozendorn, I. Kh. Sabitov, S. B. Stechkin, "Obituary: Nikolai Vladimirovich Yefimov" (in Russian), ''Uspekhi Mat. Nauk'' 38:5 (1983), 111–117.

External links

*
''A Brief Course in Analytic Geometry''
downloadable from Internet Archive {{DEFAULTSORT:Yefimov, Nikolai 1910 births 1982 deaths 20th-century Russian mathematicians People from Orenburg Corresponding Members of the USSR Academy of Sciences Moscow State University faculty Southern Federal University alumni Lenin Prize winners Recipients of the Order of the Red Banner of Labour Differential geometers Russian educators Russian mathematicians Soviet educators Soviet mathematicians