Karl-Ludwig Stellmacher

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Karl Stellmacher (Berkeley 1974)

Karl-Ludwig Stellmacher , also Karl L. Stellmacher, (born March 24, 1909 in Brandenburg (Havel) ; † March 22, 2001 in Providence , Rhode Island , USA ) was a German mathematician and university professor .

Life

Stellmacher began studying mathematics in 1927 at the Friedrichs University in Halle . There he became a member of the Corps Palaiomarchia Halle . When he was inactive , he moved to the Christian Albrechts University in Kiel and later to the Georg August University in Göttingen . In 1933 he passed the teaching examination in Göttingen. 1935 doctorate he in Goettingen at Kurt Frederick (and Gustav Herglotz ) for Dr. phil. His dissertation was later rated as a classic work on the initial value problem in general relativity (using energy integrals according to Kurt Friedrichs, who still inspired the work, but had already emigrated when wheelwright submitted his dissertation). Afterwards he was assistant to Maximilian Schuler at the chair for applied mechanics in Göttingen. He completed his habilitation in Göttingen in 1948 and became a private lecturer . In 1955 he received an associate's post .

In 1956 he moved to the University of Maryland, College Park as a professor . As head of the Institute of Fluid Dynamics & Applied Mathematics , he gave the first counterexamples in the same year to Jacques Hadamard's conjecture that the usual wave equation is the only partial differential equation that satisfies Huygens' principle . He also gave counterexamples for six and more dimensions in space-time . In 1977 he retired .

In 1960 he also received the Masurian Ribbon . After selling his house in Silver Spring in the early 1990s, he and his wife lived with their daughter Inge Verh for a few years . de Groot in Scotia (New York) . At the turn of the millennium he moved in with his grandson.

Publications

  • To the initial value problem of the gravitational equations . Mathematische Annalen 115 (1938), pp. 136–152 (the publication emerged from his dissertation)
    • Reprinted in George FR Ellis , Malcolm AH MacCallum, Andrzej Krasinski (eds.) Golden Oldies in General Relativity. Hidden Gems , Springer Verlag 2013 (with biography by Hubert Goenner and commentary by Helmut Friedrich), also in General Relativity and Gravitation, Volume 42, 2010, pp. 1769–1789
  • Propagation laws for characteristic singularities of the gravitational equations. Mathematische Annalen 115 (1938), pp. 740-783
  • Defect determination of a gyro horizon on ships with the help of the dummy plumb bob. Werft-Reederei-Hafen 19 (1938), pp. 42–44
  • Gyroscopic calculation in the complex . Report of the VDI vibration conference in Göttingen, October 1938, p. 4
  • To Schuler's principle of acceleration-free coordination . Journal for Applied Mathematics and Mechanics 19 (1939), pp. 154-165
  • Conform-invariant properties of linear partial differential equations of the hyperbolic type. o. O. 1948
  • An example of a Huyghens differential equation. News from the Academy of Sciences in Göttingen , Math.-Naturwiss. Class II, Vol. 10 (1953), p. 133
  • A class of Huygenscher differential equations and their integration . Mathematische Annalen 130 (1955), p. 219

Web links

Individual evidence

  1. ↑ a b Message from Goetz Oertel
  2. ↑ Kösener Corpslisten 1960, 55 , 479
  3. ↑ Dissertation: Propagation processes of gravitation
  4. ^ Obituary in The Washington Post , April 5, 2001, p. 6.
  5. ↑ Kösener Corpslisten 1996, 98 , 1274
  6. ↑ Jürgen Herrlein , Amella Mai (ed.): Directory of all members of the Corps Masovia 1823 to 2005 . Potsdam 2006
personal data
SURNAME Wheelwright, Karl-Ludwig
ALTERNATIVE NAMES Stellmacher, Karl-Ludwig August Philipp Wilhelm (full name)
BRIEF DESCRIPTION German mathematician and university professor
DATE OF BIRTH March 24, 1909
PLACE OF BIRTH Brandenburg (Havel)
DATE OF DEATH March 22, 2001
Place of death Providence , Rhode Island