page_title: Gerhard Hessenberg
hierarchical_section_title: Gerhard Hessenberg
caption_attribution_description: English: May 1921 Permissions from: Niedersächsische Staats- und Universitätsbibliothek, Handschriften und Nachlässe / Göttingen State and University Library, Manuscripts and Scholarly Collections Cod. Ms. Hilbert 754 Bl. 28 Nr. 136
context_page_description: Gerhard Hessenberg 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.
  In 1908 Gerhard Hessenberg was an Invited Speaker of the ICM in Rome.
context_section_description: 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.
  In 1908 Gerhard Hessenberg was an Invited Speaker of the ICM in Rome.
caption: Hessenberg in May 1921
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