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Percy John Heawood (8 September 1861 Newport, Shropshire, England〔(Times obituary )〕 - 24 January 1955 Durham, England〔GRO Register of Deaths: MAR 1955 1a 338 DURHAM C. - Percy J. Heawood〕) was a British mathematician educated at Queen Elizabeth's School, Ipswich, and Exeter College, Oxford. He spent his career at Durham University, where he was appointed Lecturer in 1885. He was, successively, Censor of St Cuthbert's Society between 1897 and 1901 succeeding Frank Byron Jevons in the role, Senior Proctor of the university from 1901, Professor in 1910 and Vice-Chancellor between 1926 and 1928. He was awarded an OBE, as Honorary Secretary of the Preservation Fund, for his part in raising £120,000 to prevent Durham Castle from collapsing into the River Wear. He devoted essentially his whole working life to the four colour theorem and in 1890 he exposed a flaw in Alfred Kempe's proof, that had been considered as valid for 11 years. With the four colour theorem being open again he established the five colour theorem instead. The four colour theorem itself was finally established by a computer-based proof in 1976. Writing in the Journal of the London Mathematical Society, G A Dirac, wrote: He was fond of country pursuits, and one of his interests, unusual for a mathematician, was Hebrew.〔(Times obituary )〕 His nickname was "Pussy".〔Tudor, Henry, 'St. Cuthbert's Society, 1888-1988: the history of 'a modest but exciting institution in the University of Durham'. 1988.〕 He was a cousin of the physicist Sir Oliver Lodge. Durham University awards an annual Heawood Prize to a student graduating in Mathematics whose performance is outstanding in the final year. ==See also== *Heawood conjecture *Heawood number *Heawood graph *four colour theorem *five colour theorem 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Percy John Heawood」の詳細全文を読む スポンサード リンク
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