Nikolai Vladimirovich Yefimov (; 31 May 1910 in

Orenburg Orenburg (, ), formerly known as Chkalov (1938–1957), is the administrative center of Orenburg Oblast, Russia. It lies in Eastern Europe, along the banks of the Ural River, being approximately southeast of Moscow. Orenburg is close to the ...

– 14 August 1982 in

Moscow Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...

) 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, mathematical structure, structure, space, Mathematica ...

. He is most famous for his work on generalized

Hilbert David Hilbert (; ; 23 January 1862 – 14 February 1943) was a German mathematician and philosophy of mathematics, philosopher of mathematics and one of the most influential mathematicians of his time. Hilbert discovered and developed a broad ...

's problem on surfaces of negative

curvature In mathematics, curvature is any of several strongly related concepts in geometry that intuitively measure the amount by which a curve deviates from being a straight line or by which a surface deviates from being a plane. If a curve or su ...

. Yefimov grew up in

Rostov-on-Don Rostov-on-Don 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 European Plain on the Don River, from the Sea of Azov, directly north of t ...

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. In 2023 ''US News & World Repor ...

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

Voronezh State University Voronezh State University (, ВГУ; VSU) 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 ...

from 1934 to 1941. He taught at the

Moscow State University Moscow State University (MSU), officially M. V. Lomonosov Moscow State University,. is a public university, public research university in Moscow, Russia. The university includes 15 research institutes, 43 faculties, more than 300 departments, a ...

since 1946.

Aleksei Pogorelov Aleksei Vasilyevich Pogorelov (, ; 3 March 1919 – 17 December 2002), was a Soviet mathematician. Specialist in the field of convex and differential geometry, geometric PDEs and elastic shells theory, the author of novel school textbooks on ...

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 establishe ...

in 1951 and

Lenin Prize The Lenin Prize (, ) was one of the most prestigious awards of the Soviet Union for accomplishments relating to science, literature, arts, architecture, and technology. It was originally created on June 23, 1925, and awarded until 1934. During ...

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 The Academy of Sciences of the Soviet Union was the highest scientific institution of the Soviet Union from 1925 to 1991. It united the country's leading scientists and was subordinated directly to the Council of Ministers of the Soviet Union (un ...

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 Academic staff of Moscow State University Southern Federal University alumni Recipients of the Lenin Prize Recipients of the Order of the Red Banner of Labour Differential geometers Russian educators Soviet educators Soviet mathematicians