Stefan Warschawski

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Stefan Emanuel Warschawski (born April 8, 1904 in Lida , Vilnius Governorate, † May 5, 1989 in San Diego ) was an American mathematician.

Life

Warschawski was born as the son of a doctor in the then Russian (from 1919 Polish, now Belarusian) Lida. The family spoke German and lived in Königsberg from 1915, where Stefan Warschawski went to school. From 1924 he studied mathematics at the University of Königsberg (with Konrad Knopp and Werner Rogosinski ), in Göttingen (1926/27) and Basel (where he followed Alexander Ostrowski ). In 1932 he received his doctorate summa cum laude under Alexander Ostrowski in Basel (on the boundary value behavior of the derivation of the mapping function with conformal mapping). From 1930 to 1933 he was an assistant at the Mathematical Institute in Göttingen, a post that he lost when the National Socialists came to power in 1933 because he was Jewish. He emigrated first to the Netherlands (Utrecht University) and then to the USA, was at Columbia University in New York and in 1939 first assistant professor and then associate professor at Washington University in St. Louis. During the Second World War he became a professor at Brown University and later at the University of Minnesota , where he became head of the mathematics faculty in 1952, and in 1963 at the University of California, San Diego , where he held the chair of mathematics until 1967, which he resigned for health reasons. In 1971 he retired, but remained scientifically active.

He dealt with the theory of conformal mapping, also from a numerical point of view. The theorem of Kiyoshi Noshiro and Warschawski says that an analytic function on the open unit disk with a positive real part of the first derivative is one-to-one (i.e. simple). In 1980 he solved the Visser-Ostrowski problem of the boundary behavior of the derivation of a conformal mapping.

A professorship and scholarship was named after him at the University of California at San Diego. His wife Ilse Kayser, who died in 2009 and whom he married in 1947, bequeathed $ 1 million to the university.

literature

  • F. David Lesley, Biography of SE Warschawski, Complex Variables, Theory and Application 5, 1986, pp. 95-109,
  • Maximilian Pinl Colleagues in a Dark Time , Annual Report DMV, 72, 1970, pp. 184-185

Web links

Individual evidence

  1. ^ Date of birth according to Pinl, Kollegen in dark time, annual report DMV 1970, p. 184. McTutor states April 18.
  2. ^ Warshawski, On the higher derivatives at the boundary in conformal mapping, Transactions of the American Mathematical Society, 38, 1935, pp. 310-334
  3. ↑ Warschawski, Burton Rodin: On the derivative of the Riemann mapping function near a boundary point and the Visser-Ostrowski problem, Mathematische Annalen, 248, 1980, 125-137
personal data
SURNAME Warschawski, Stefan
ALTERNATIVE NAMES Warschawski, Stefan Emanuel (full name)
BRIEF DESCRIPTION American mathematician
DATE OF BIRTH April 8, 1904
PLACE OF BIRTH Lida , Vilnius Governorate
DATE OF DEATH May 5th 1989
Place of death San Diego