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Karol Borsuk (May 8, 1905 – January 24, 1982) was a Polish mathematician. His main interest was topology. Borsuk introduced the theory of ''absolute retracts'' (ARs) and ''absolute neighborhood retracts'' (ANRs), and the cohomotopy groups, later called Borsuk–Spanier cohomotopy groups. He also founded the so-called Shape theory. He has constructed various beautiful examples of topological spaces, e.g. an acyclic, 3-dimensional continuum which admits a fixed point free homeomorphism onto itself; also 2-dimensional, contractible polyhedra which have no free edge. His topological and geometric conjectures and themes stimulated research for more than half a century. Borsuk received his master's degree and doctorate from Warsaw University in 1927 and 1930, respectively; his Ph.D. thesis advisor was Stefan Mazurkiewicz. He was a member of the Polish Academy of Sciences from 1952. Borsuk's students included Samuel Eilenberg, Andrzej Granas, Jan Jaworowski, Hanna Patkowska, Krystyna Kuperberg, Włodzimierz Kuperberg, Henryk Toruńczyk, Włodzimierz Holsztyński, Andrzej Trybulec and Jerzy Dydak, ==See also== * Borsuk's conjecture * Borsuk–Ulam theorem * Zygmunt Janiszewski * Stanislaw Ulam * Scottish Café * Animal Husbandry, an educational dice game published by Borsuk at his own expense in 1943 during the German occupation of Warsaw. 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「Karol Borsuk」の詳細全文を読む スポンサード リンク
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