Karl Stein (mathematician)

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
Karl Stein in Eichstätt, 1968
Born
Frank Reginald Nunes Nabarro

(1913-01-01)1 January 1913
Hamm, Westphalia
Died19 October 2000(2000-10-19) (aged 87)
Ebersbach an der Fils, Baden-Württemberg
Alma materUniversity of Münster
Known forStein manifold
Stein factorization
Behnke–Stein theorem
Behnke–Stein theorem on Stein manifolds
Remmert–Stein theorem
AwardsCantor Medal (1990)
Scientific career
FieldsComplex analysis
Cryptography
InstitutionsLudwig Maximilian University of Munich
Academic advisorsHeinrich Behnke
Doctoral studentsOtto Forster
Gunther Schmidt
Martin Schottenloher

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.[2]

Students

Stein's doctoral students included Michael Schneider, Otto Forster, Ivo Schneider, Gunther Schmidt and Martin Schottenloher.

References
  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
  2. "The Georg Cantor Medal of the Deutsche Mathematiker-Vereinigung", MacTutor History of Mathematics Archive, University of St Andrews, retrieved 1 April 2024
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