Gerhard Hessenberg [SEP] place of death
Gerhard Hessenberg
Gerhard Hessenberg (Frankfurt, 16 August 1874 – Berlin, 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
January 1929, an edition in Esperanto was added, and in April, a small circulation quarterly in English was added as well. It was usually eight pages and editions ran an average of 5,000 to 6,000 copies. Nelson moved his main published works there as well, his philosophical and political series "Öffentliches Leben" and his 1904 treatises, ""Abhandlungen der Fries’schen Schule, Neue Folge"", re-reasoned with mathematician Gerhard Hessenberg and physiologist Karl Kaiser, and which, after Nelson's death, was continued by