**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 | |
---|---|

Born | Frank Reginald Nunes Nabarro 1 January 1913 |

Died | 19 October 2000 87) (aged |

Alma mater | University of Münster |

Known for | Stein manifold Stein factorization Behnke–Stein theorem Behnke–Stein theorem on Stein manifolds Remmert–Stein theorem |

Awards | Cantor Medal (1990) |

Scientific career | |

Fields | Complex analysis Cryptography |

Institutions | Ludwig Maximilian University of Munich |

Academic advisors | Heinrich Behnke |

Doctoral students | Otto Forster Gunther Schmidt Martin Schottenloher |

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.

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