Klaus Steffen

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Klaus Steffen (born January 8, 1945 in Bensheim ) is a German mathematician who deals with differential geometry and geometry .

Steffen studied mathematics from 1963 to 1967 at the University of Münster with a diploma in 1967, then was an assistant at the Johannes Gutenberg University in Mainz , where he did his doctorate in 1971 under Stefan Hildebrandt (theorems of existence for surfaces of constant mean curvature with a given edge curve) . From 1971 he was an assistant at the University of Bonn , where he completed his habilitation in 1973. In 1975 he became scientific advisor and professor at the University of Cologne . In 1976 he became a full professor of mathematics at the University of Düsseldorf, later Heinrich Heine University Düsseldorf . On July 21, 1987 he was elected chairman of the convention of the University of Düsseldorf. In 1988/89 he advocated - like his deputies Sandra Grätz (group of scientific staff), Susanne Gutsche (group of non-scientific staff), Uwe Krause (group of students) and the majority of the convention members at the time - the naming of the university after Heinrich Heine .

He gave a simple example of a flexible polyhedron (the first example of which without self- intersection was found by Robert Connelly in 1977 ), with fourteen triangular faces and nine corners.

Fonts

  • with Frank Duzaar & Giuseppe Mingione : Parabolic systems with polynomial growth and regularity , American Mathematical Society 2011.

Individual evidence

  1. ↑ Michael Toeppell, General Directory of Members of the DMV 1890-1990, Munich 1991
  2. ^ Mathematics Genealogy Project
  3. ↑ http://www.mi.uni-koeln.de/home-institut/alle/Personen/HistorischesZumInstitut.de.html
  4. ↑ Düsseldorfer Uni-Zeitung 1987, year 16, No. 6, p. 2. New board of the convention elected
  5. ↑ see the minutes of the meeting of the convention on April 26, 1989 in lecture hall 2A of building 22.01
  6. ↑ Shown in Dmitry Fuchs , Sergei Tabachnikov Ein Schaubild der Mathematik , Springer 2011, with photo by Steffen. Animation of the Steffen polyhedron , at Wolfram Research , further animation
personal data
SURNAME Steffen, Klaus
BRIEF DESCRIPTION German mathematician
DATE OF BIRTH January 8, 1945
PLACE OF BIRTH Bensheim