Karl Stein (mathematician)

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Karl Stein in Eichstätt, 1968

Karl Stein (1 January 1913 in Hamm, Westphalia – 19 October 2000) was a German mathematician. He is well known for complex analysis and cryptography. Stein manifolds and Stein factorization are named after him.


Karl Stein received his doctorate with his dissertation on the topic Zur Theorie der Funktionen mehrerer komplexer Veränderlichen; Die Regularitätshüllen niederdimensionaler Mannigfaltigkeiten at the University of Münster under the supervision of Heinrich Behnke in 1937. Karl Stein was conscripted into the Wehrmacht sometime before 1942, and trained as a cryptographer to work at OKW/Chi, the Cipher Department of the High Command of the Wehrmacht. He was assigned to manage the OKW/Chi IV, Subsection a, which was a unit responsible for security of own processes, cipher devices testing, and invention of new cipher devices. He managed a staff of 11[1] In 1955 he became professor at the Ludwig Maximilians University of Munich and emeritated in 1981. In 1990 he received the first Cantor medal.

See also[edit]

See also[edit]

His doctoral descendents include Michael Schneider (Universität Bayreuth), Otto Forster, Ivo Schneider, Gunther Schmidt and Martin Schottenloher.


  1. ^ Christof Teuscher (2004). Alan Turing: Life and Legacy of a Great Thinker. Springer Science & Business Media. p. 464. ISBN 978-3-540-20020-8.