Stefan or Stephan Cohn-Vossen (28 May 1902 – 25 June 1936) was a mathematician, who was responsible for Cohn-Vossen's inequality and the Cohn-Vossen transformation is also named for him. He proved the first version of Splitting theorem. He was also known for his collaboration with David Hilbert on the 1932 book Anschauliche Geometrie, translated into English as Geometry and the Imagination.
in Moscow, probably 1936
|Died||June 25, 1936 (aged 34)|
|Cause of death||Pneumonia|
|Alma mater||Wrocław University|
|Known for||Cohn-Vossen's inequality|
|Thesis||Singuläre Punkte reeller, schlichter Kurvenscharen, deren Differentialgleichung gegeben ist (1924)|
|Doctoral advisor||Adolf Kneser|
He was born in Breslau (then a city in the German Empire; now Wrocław in Poland). He wrote a 1924 doctoral dissertation at the University of Breslau (now the University of Wrocław) under the supervision of Adolf Kneser. He became a professor at the University of Cologne in 1930.
He was barred from lecturing in 1933 under Nazi racial legislation, because he was Jewish. In 1934 he emigrated to the USSR, with some help from Herman Müntz. While there, he taught at Leningrad University. He died in Moscow from pneumonia.
- Voitsekhovskii, M.I. (2001) , "Cohn-Vossen transformation", in Hazewinkel, Michiel (ed.), Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4
- Hilbert, David; Cohn-Vossen, Stephan (1952). Geometry and the Imagination (2nd ed.). Chelsea. ISBN 0-8284-1087-9.CS1 maint: Multiple names: authors list (link)
- Stephan Cohn-Vossen at the Mathematics Genealogy Project
- Siegmund-Schultze, Reinhard (2009), Mathematicians Fleeing from Nazi Germany: Individual Fates and Global Impact, Princeton University Press, pp. 132, 133, 346, 370, 373, 399, ISBN 9780691140414.
- Siegmund-Schultze 2009 (p.133) quotes from a 1937 letter by Müntz: "The appointments of Cohn-Vossen, Walfisz, Pollaczek (the latter was not allowed to slip in again) were immediately influenced by myself, the ones for Plessner and Bergmann indirectly."
- Cohn-Vossen's Obituary (in Russian)