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Veniamin Fedorovich Kagan.

Veniamin Fedorovich Kagan ( )(10 March 18698 May 1953) was a Russianmarker mathematician and expert in geometry. He is the maternal grandfather of mathematician Yakov Sinai.


Kagan was born in Shavlimarker, Imperial Russiamarker (now Šiauliaimarker, Lithuaniamarker) in 1869, to a poor Jewish family. In 1871 his family moved to Yekaterinoslavmarker (now Dnipropetrovskmarker), where he grew up. Kagan entered the Imperial Novorossiya University in Odessamarker in 1887, but was expelled for revolutionary activities in 1889. He was put on probation and sent back to Yekaterinoslav. He studied mathematics on his own and in 1892 passed the state exam at Kiev University.

In 1894 Kagan moved to St Petersburgmarker where he continued his studies with Andrey Markov and Konstantin Posse. They tried to help him to obtain an academic position, but Kagan's Jewish background was an obstacle. Only in 1897 was he allowed to became a dozent at the Imperial Novorossiya University, where he continued to work until 1923. His students in the theory of relativity class he taught in 1921-22 included Nikolaj Papaleksi, Alexander Frumkin and Igor Tamm.Kagan worked at Moscow State Universitymarker where he held the Geometry Chair from 1923 till 1952. Aging and disillusioned with anti-Semitic practices, he resigned from the university and died in Moscowmarker soon afterwards.

Mathematical work

He published over 100 mathematical papers in different parts of geometry, particularly on Lobachevsky geometry and on Riemannian geometry. He received the USSR State Prize in 1943. He founded the science publisher Mathesis in Odessa. He was a director of the mathematics and natural sciences department of the Great Soviet Encyclopaedia. He wrote a definitive biography of Nikolai Lobachevsky and edited his collected works (5 volumes, 1946–1951).

Kagan's doctoral students include Pyotr Rashevsky, Viktor Wagner and Isaak Yaglom.


  • Mathematician Veniamin Fedorovich Kagan from Odessa is a minor character in The Fourth Prose (1930) by Osip Mandelstam.

External links

  • Biography – in the "Kstati" newspaper (in Russian)

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