Hans Lewy

Hans Lewy (20 October 1904 – 23 August 1988) was a Jewish German born American mathematician, known for his work on partial differential equations and on the theory of functions of several complex variables.[3]

Hans Lewy
Hans Lewy in 1975
(photo by George Bergman)
Born(1904-10-20)October 20, 1904
Breslau
DiedAugust 23, 1988(1988-08-23) (aged 83)
Berkeley, California, United States of America
NationalityAmerican
Alma materUniversity of Göttingen
Known forCourant–Friedrichs–Lewy condition, Lewy's example
AwardsWolf Prize (1986)[1]
Scientific career
FieldsMathematical analysis, partial differential equations, several complex variables
Doctoral advisorRichard Courant[2]
Doctoral studentsDavid Kinderlehrer
Influencednumerical analysis, partial differential equations, several complex variables

Life

Lewy was born in Breslau, Germany (now Wrocław, Poland), on October 20, 1904. He began his studies at the University of Göttingen in 1922, after being advised to avoid the more local University of Breslau because it was too old-fashioned,[4][5] supporting himself during the Weimar hyperinflation by a side job doing railroad track maintenance.[5] At Göttingen, he studied both mathematics and physics; his teachers there included Max Born, Richard Courant, James Franck, David Hilbert, Edmund Landau, Emmy Noether, and Alexander Ostrowski. He earned his doctorate in 1926, at which time he and his friend Kurt Otto Friedrichs both became assistants to Courant and privatdozents at Göttingen. The famous Courant-Friedrichs-Lewy condition originated from that time in 1928.[4][5]

At the recommendation of Courant, Lewy was granted a Rockefeller Fellowship, which he used in 1929 to travel to Rome and study algebraic geometry with Tullio Levi-Civita and Federigo Enriques, and then in 1930 to travel to Paris, where he attended the seminar of Jacques Hadamard. After Hitler's election as chancellor in 1933, Lewy was advised by Herbert Busemann to leave Germany again. He was offered a position in Madrid, but declined it, fearing for the future there under Francisco Franco. He revisited Italy and France, but then at the invitation of the Emergency Committee in Aid of Displaced Foreign Scholars and with the assistance of Hadamard found a two-year position in America at Brown University. At the end of that term, in 1935, he moved to the University of California, Berkeley.[4][5]

During World War II, Lewy obtained a pilot's license, but then worked at the Aberdeen Proving Ground. He married Helen Crosby in 1947.[5]

In 1950, Lewy was fired from Berkeley for refusing to sign a loyalty oath.[5][6][7] He taught at Harvard University and Stanford University in 1952 and 1953[5] before being reinstated by the California Supreme Court case Tolman v. Underhill.[6][7]

He retired from Berkeley in 1972, and in 1973 became one of two Ordway Professors of Mathematics at the University of Minnesota. He died on August 23, 1988, in Berkeley.[5][6][8]

Lewy is known for his outstanding and stunning contributions to partial differential equations. In 1957, his famous example of a second-order linear partial differential equation was so stunning and unexpected that the whole field steered in a new direction, as well as shaping modern analysis in a significant way. Based on this example, Louis Nirenberg, Lars Hörmander and others have outlined some important changes to the theory and structure of the field. This was adopted by many analysts and mathematicians as a major development.

He also worked on several complex variables in relation to nonlinear hyperbolic equations and elliptic equations, well-posedness for initial value problems of wave fronts (now commonly called Sobolev spaces) in the early 1930s, solutions of the classical problems of Hermann Weyl and Hermann Minkowski for analytical data (the original problem was solved by Louis Nirenberg in 1949 as part of his PhD thesis), the extendibility of minimal surfaces on and analytical nature of its boundaries which is fully free or in part, free boundary problems of water wave fronts in hydrodynamics, and the proof of quadratic reciprocity theorem in number theory from 'hydrodynamical' perspective.

Awards and honors

Lewy was elected to the National Academy of Sciences in 1964, and was also a member of the American Academy of Arts and Sciences.[6] He became a foreign member of the Accademia dei Lincei in 1972.[5] He was awarded a Leroy P. Steele Prize in 1979,[5] and a Wolf Prize in Mathematics in 1986 for his work on partial differential equations.[1] In 1986, the University of Bonn gave him an honorary doctorate.[8]

Publications

A selection of his work, edited by David Kinderlehrer and including his most important works, was published as the two volume work (Kinderlehrer 2002a) and (Kinderlehrer 2002b)

The following works are included in his "Selecta" in their original language or translated form.

gollark: Also also radio waves.
gollark: If we're doing cool eye features, I also want to see polarization like cuttlefish or whatever it is.
gollark: Yes, but it isn't very high-bandwidth and doesn't have direct write access.
gollark: Computers are WILDLY insecure on SO MANY LEVELS.
gollark: We don't actually have neuralinks, and I don't trust them.

See also

References
  1. Wolf Foundation (2003), THE 1984/5 WOLF FOUNDATION PRIZE IN MATHEMATICS (in Hebrew), retrieved September 14, 2013.
  2. Hans Lewy at the Mathematics Genealogy Project
  3. Chern, Shiing-Shen; Hirzebruch, Friedrich, eds. (2001). ""Hans Lewy" prepared by S. Hildebrandt". Wolf Prize. vol. 2. World Scientific. pp. 264–310.
  4. Albers, Donald J.; Alexanderson, Gerald L.; Reid, Constance, eds. (1990), "Hans Lewy", More Mathematical People, Harcourt Brace Jovanovich, pp. 180–194.
  5. Kinderlehrer, David (2002), "Hans Lewy. A brief biographical sketch", in Kinderlehrer, David (ed.), Hans Lewy Selecta. Volume 2, Contemporary Mathematicians, Boston-Basel-Stuttgart: Birkhäuser Verlag, ISBN 0-8176-3524-6.
  6. "Dr. Hans Lewy, 83, Mathematics Professor", The New York Times, September 2, 1988
  7. Sherri Chasin Calvo (2000), "Politics Impinges upon Mathematics", in Neil Schlager (ed.), Science and Its Times: Understanding the Social Significance of Scientific Discovery. Vol. VII: 1950 to present, Gale Group, pp. 242–244, ISBN 978-0-7876-3939-6.
  8. Protter, M.; J. L., Kelley; Kato, T.; Lehmer, D. H. (1988), "Hans Lewy, Mathematics: Berkeley. 1904-1988 Professor Emeritus", in Krogh, David (ed.), 1988, University of California: In Memoriam, Berkeley, CA: University of California, Berkeley, pp. 85–87.
  9. Reid, W. T. (1940). "Review: Aspects of the Calculus of Variations, notes by J. W. Green from lectures by Hans Lewy". Bulletin of the American Mathematical Society. 46 (7): 595–596. doi:10.1090/s0002-9904-1940-07238-6.
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