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Alexander Gelfond
Alexander Osipovich Gelfond ((ロシア語:Алекса́ндр О́сипович Ге́льфонд); 24 October 1906 – 7 November 1968) was a Soviet mathematician. Gelfond's theorem is named after him.
==Biography==
Alexander Gelfond was born in Saint Petersburg, Russian Empire in the family of a professional physician and amateur philosopher Osip Gelfond. He entered the Moscow State University in 1924, started his postgraduate studies there in 1927 and obtained his PhD in 1930. His advisors were Alexander Khinchin and Vyacheslav Stepanov.
In 1930 he stayed for five months in Germany (in Berlin and Göttingen) where he worked with Edmund Landau, Carl Ludwig Siegel and David Hilbert. In 1931 he started teaching as a Professor at the Moscow State University and worked there until the last day of his life. Since 1933 he also worked at the Steklov Institute of Mathematics.
In 1939 he was elected a Corresponding member of the Academy of Sciences of the Soviet Union for his works in the field of Cryptography. According to Vladimir Arnold, during World War II Gelfond was the Chief Cryptographer of the Soviet Navy.
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