Heinrich Heesch (June 25, 1906 – July 26, 1995) was a German mathematician. He was born in Kiel and died in Hanover. In Göttingen he worked on Group theory. In 1933 Heesch witnessed the National Socialist purges of university staff. Not willing to become a member of the National Socialist organization of university teachers as required, he resigned from his university position in 1935 and worked privately at his parents' home in Kiel until 1948.
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| - Heinrich Heesch (de)
- Heinrich Heesch (fr)
- Heinrich Heesch (en)
- Heinrich Heesch (pt)
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| - Heinrich Heesch (* 25. Juni 1906 in Kiel; † 26. Juli 1995 in Hannover) war ein deutscher Mathematiker, der sich mit Geometrie und Diskreter Mathematik beschäftigte. (de)
- Heinrich Heesch (25 juin 1906, Kiel – 26 juillet 1995, Hanovre) est un mathématicien allemand, connu notamment pour son travail sur la cristallographie et le théorème des quatre couleurs. (fr)
- Heinrich Heesch (June 25, 1906 – July 26, 1995) was a German mathematician. He was born in Kiel and died in Hanover. In Göttingen he worked on Group theory. In 1933 Heesch witnessed the National Socialist purges of university staff. Not willing to become a member of the National Socialist organization of university teachers as required, he resigned from his university position in 1935 and worked privately at his parents' home in Kiel until 1948. (en)
- Heinrich Heesch (Quiel, 25 de junho de 1906 — Hanôver, 26 de julho de 1995) foi um matemático alemão. Na Universidade de Gotinga trabalhou com teoria dos grupos. Em 1993 Heesch testemunhou o expurgo Nacional Socialista dentre os membros da universidade. Não querendo tornar-se membro da organização nacional socialista, filiação obrigatória para os professores universitários, desistiu de sua posição universitária e foi trabalhar com seus pais em Quiel, até 1948. (pt)
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| - Heinrich Heesch (* 25. Juni 1906 in Kiel; † 26. Juli 1995 in Hannover) war ein deutscher Mathematiker, der sich mit Geometrie und Diskreter Mathematik beschäftigte. (de)
- Heinrich Heesch (June 25, 1906 – July 26, 1995) was a German mathematician. He was born in Kiel and died in Hanover. In Göttingen he worked on Group theory. In 1933 Heesch witnessed the National Socialist purges of university staff. Not willing to become a member of the National Socialist organization of university teachers as required, he resigned from his university position in 1935 and worked privately at his parents' home in Kiel until 1948. During this time he did research on tilings. In 1955 Heesch began teaching at Leibniz University Hannover and worked on graph theory. In this period Heesch did pioneering work in developing methods for a computer-aided proof of the then unproved four color theorem. In particular, he was the first to investigate the notion of "discharging", which turned out to be a fundamental ingredient of the eventual computer-aided proof by Kenneth Appel and Wolfgang Haken. Between 1967 and 1971, Heesch made several visits to the United States, where bigger and faster computers were available, working with Haken at University of Illinois at Urbana-Champaign and with and Yoshio Shimamoto at Brookhaven National Laboratory. During the crucial phase of his project, the German national research fund DFG cancelled financial support. After the 1977 success of Appel and Haken, Heesch worked on refining and shortening their proof, even after his retirement. (en)
- Heinrich Heesch (25 juin 1906, Kiel – 26 juillet 1995, Hanovre) est un mathématicien allemand, connu notamment pour son travail sur la cristallographie et le théorème des quatre couleurs. (fr)
- Heinrich Heesch (Quiel, 25 de junho de 1906 — Hanôver, 26 de julho de 1995) foi um matemático alemão. Na Universidade de Gotinga trabalhou com teoria dos grupos. Em 1993 Heesch testemunhou o expurgo Nacional Socialista dentre os membros da universidade. Não querendo tornar-se membro da organização nacional socialista, filiação obrigatória para os professores universitários, desistiu de sua posição universitária e foi trabalhar com seus pais em Quiel, até 1948. Durante este tempo pesquisou sobre tesselação. Em 1955 começou a lecionar na Universidade de Hannover, trabalhando com teoria dos grafos. Neste período desenvolveu trabalho pioneiro com métodos para uma prova auxiliada por computador do então ainda sem ser provado teorema das quatro cores. Em particular, foi o primeiro a investigar a noção de "descarga", que tornou-se fundamental para a prova auxiliada por computador realizada por Kenneth Appel e Wolfgang Haken. Entre 1967 e 1971 Heesch viajou para os Estados Unidos diversas vezes, onde computadores mais potentes estavam disponíveis, e onde trabalhou com Haken e . Durante a fase crucial deste projeto, a agência financiadora alemã DFG cancelou o suporte financeiro. Após o sucesso de Appel e Haken, Heesch trabalhou no aprimoramento e simplificação de suas provas, tarefa que efetuou até mesmo depois de aposentar-se. (pt)
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