Karl Stein (mathematician)

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.

Career[]

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 Maximilian University of Munich and emeritated in 1981. In 1990 he received the first Cantor medal.^{[citation needed]}

Students[]

Stein's doctoral students included  [de], Otto Forster,  [de], Gunther Schmidt and Martin Schottenloher.

See also[]

• Behnke–Stein theorem
• Remmert–Stein theorem

References[]

• Huckleberry, Alan (2008), "Karl Stein (1913–2000)", Jahresbericht der Deutschen Mathematiker-Vereinigung, 110 (4): 195–206, arXiv:1003.6025, Bibcode:2010arXiv1003.6025H, ISSN 0012-0456, MR 2479879
• Karl Stein at the Mathematics Genealogy Project