Fritz John
| Fritz John | |
|---|---|
 |
|
| Born |
14 June 1910 Berlin, Germany |
| Died | 10 February 1994 (aged 83) New York City, United States |
| Nationality | United States |
| Fields | Mathematics |
| Institutions |
University of Kentucky Ballistic Research Laboratory New York University |
| Alma mater | University of Göttingen |
| Doctoral students |
Clifford Gardner Sergiu Klainerman |
| Known for |
John-Nirenberg Inequality John's equation John ellipsoid |
| Notable awards |
Birkhoff Prize (1973) Steele Prize (1982) |
Fritz John (14 June 1910 – 10 February 1994) was a German-born mathematician specialising in partial differential equations and ill-posed problems. His early work was on the Radon transform and he is remembered for John's equation.
John was born in Berlin, Imperial Germany, the son of Hedwig (née Bürgel) and Hermann Jacobson-John. He studied mathematics from 1929 to 1933 in Göttingen where he was influenced by Richard Courant among others. With Hitler's rise to power in 1933 "non-aryans" were being expelled from teaching posts, and John, being half Jewish, emigrated from Germany and immigrated to England.
John published his first paper in 1934 on Morse theory. He was awarded his doctorate in 1934 with a thesis entitled Determining a function from its integrals over certain manifolds from Göttingen. With Richard Courant's assistance he spent a year at St John's College, Cambridge. During this time he published papers on the Radon transform, a theme to which he would return.
John was appointed an assistant professor at the University of Kentucky in 1935 and he emigrated to the United States becoming naturalised in 1941. He stayed at Kentucky until 1946 apart from 1943 to 1945 during which he did war service for the Ballistic Research Laboratory at the Aberdeen Proving Ground, Maryland. In 1946 he moved to New York University where he remained.
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