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Béla Kerékjártó (October 1, 1898, Budapest–June 26, 1946, Gyöngyös) was a Hungarian mathematician who wrote numerous articles on topology. Kerékjártó earned his Ph.D. degree from the University of Budapest. He taught at the Faculty of Sciences of the University of Szeged from 1922. In 1921 he introduced his program with a speech "On topological fundamentals of analysis and geometry" where he advocated that "complex analysis should be built with instruments of topology without metric elements such as length and area."〔M. Bognár & Á. Csázár, "Topology" (pp 9 to 25) in (A Panorama of Hungarian Mathematics in the Twentieth Century ), János Horváth (editor) Bolyai Society Mathematical Studies 14, link from Google Books〕 In 1923, he published one of the first books on Topology, and it was reviewed by Solomon Lefschetz in 1925.〔Solomon Lefschetz (1925) (Review: ''Vorlesungen über Topologie'' ), Bulletin of the American Mathematical Society 31(3-4):176〕 Hermann Weyl wrote that this book completely changed his views of the subject. In 1919 he published a theorem on periodic homeomorphisms of the disc and the sphere.〔B. Kerekjarto (1919) "Uber die periodische transformationen der Kreisscheibe und die Kugelflasche", Mathematische Annalen 80:36–8〕 A claim to priority to the result was made by L. E. J. Brouwer, and the subject was revisited by Samuel Eilenberg in 1934.〔S. Eilenberg (1934) "Sur les transformationes periodique de la surface de la sphere", ''Fundamentica Mathematica'' 22:28–44〕 A modern treatment of Kerekjarto's theorm has been presented by Constantin and Kolev.〔Adrian Constantin and Boris Kolev (2003) (The theorem of Kerekjarto on periodic homeomorphisms of the disc and sphere ) from Internet Archive〕 In 1938 he returned to Budapest to teach in university there. Kerékjártó proved that the sphere is the only compact surface that admits a 3-transitive topological group in 1941.〔Béla Kerékjártó (1941) "Sur la character topologique du groupe homographique de la sphere", Acta Mathematica 74:311–41〕 ==Books== * ''Vorlesungen über Topologie Bd.1 Flächentopologie'' (1923) Springer, Grundlehren der mathematischen Wissenschaften. * ''Les fondements de la géométrie. Bd.1. La construction élémentaire de la géométrie euclidienne'' (1955) Gauthier-Villars. * ''Les fondaments de la géométrie Bd.2, Geometrie projective'' (1966) Gauthiers Villars. 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「Béla Kerékjártó」の詳細全文を読む スポンサード リンク
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