Kurt Strebel (20 April 1921 – 26 October 2013) was a Swiss mathematician, specializing in
geometric function theory.
Education and career
Strebel was born on 20 April 1921 in
Wohlen, Aargau. received in 1953 his PhD from the
University of Zurich under
Rolf Nevanlinna with thesis Über das Kreisnormierungsproblem der konformen Abbildung (On the circle normalization problem of conformal mapping).[1] From 1953 to 1955 he was at the Institute for Advanced Study and at Stanford University. He became a professor at the
University of Fribourg in 1955 and then successor to Nevanlinna at the University of Zurich in 1963.
Strebel founded the Nevanlinna Colloquium in Zürich (later also elsewhere) with another of Nevanlinna's former students, the professor Hans Künzi, to maintain contacts with Nevanlinna.[2] The Nevanlinna Colloquium is usually held in Europe and covers most of classical complex analysis.[3]
In 1977 Strebel was elected a member of the
Finnish Academy of Sciences. He was an Invited Speaker at the
ICM in 1974 in Vancouver.[4]
He died on 26 October 2013 in
Zürich. Named in his honor is the Strebel differential in the
Teichmüller theory.
Zur Frage der Eindeutigkeit extremaler quasikonformer Abbildungen des Einheitskreises. Comment. Math. Helv. 36, 1962, 306-323, Part 1 of article
doi:
10.1007/BF02566904, Comment. Math. Helv. 39, 1964, 77-89, Part 2 of article
doi:
10.1007/BF02566945
Über quadratische Differentiale mit geschlossenen Trajektorien und extremale quasikonforme Abbildungen. in Festband zum 70. Geburtstag von Rolf Nevanlinna, Springer Verlag, 1966, 105–127.
doi:
10.1007/978-3-642-86699-9_13
with Edgar Reich: On quasiconformal mappings which keep the boundary points fixed. Trans. Amer. Math. Soc. 138, 1969, 211–222.
doi:
10.1090/S0002-9947-1969-0237778-3
with Edgar Reich: Extremal plane quasiconformal mappings with given boundary values. Bull. Amer. Math. Soc. 79, 1973, 488–490.
doi:
10.1090/S0002-9904-1973-13232-X
with Edgar Reich: Extremal quasiconformal mappings with given boundary values. in Contributions to Analysis. A collection of papers dedicated to
Lipman Bers. Academic Press, 1974, 375–391.
doi:
10.1016/B978-0-12-044850-0.50035-6
^Strebel, Kurt. "On quadratic differentials and extremal quasi-conformal mappings." In Proceedings of the International Congress of Mathematicians, vol. 2, p. 223. Canadian Mathematical Congress, 1975.
^Tynan, Philip (2009). "Explicit Examples of Strebel Differentials".
arXiv:0910.4752 [
math.DG].