Gerhard Hessenberg
(1874-1925)
German mathematician
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Gerhard Hessenberg (16 August 1874 – 16 November 1925) was a German mathematician. He received his Ph.D. from the University of Berlin in 1899 under the guidance of Hermann Schwarz and Lazarus Fuchs. His name is usually associated with projective geometry, where he is known for proving that Desargues' theorem is a consequence of Pappus's hexagon theorem, and differential geometry where he is known for introducing the concept of a connection. He was also a set theorist: the Hessenberg sum and product of ordinals are named after him. However, Hessenberg matrices are named for Karl Hessenberg, a near relative.
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| Born |
16 August 1874 Frankfurt
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| Died |
16 November 1925 (aged 51) Berlin
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| Zodiac | Leo |
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