Karol Borsuk
Karol Borsuk (8 May 1905 – 24 January 1982) was a Polish mathematician. His main interest was topology, while he obtained significant results also in functional analysis.
Karol Borsuk | |
|---|---|
| Born | 8 May 1905 Warsaw, Vistula Land, Russian Empire |
| Died | 24 January 1982 (aged 76) Warsaw, Poland |
| Nationality | Polish |
| Alma mater | Warsaw University |
| Known for | Borsuk's conjecture Borsuk–Ulam theorem Bing–Borsuk conjecture |
| Scientific career | |
| Fields | Mathematics |
| Doctoral advisor | Stefan Mazurkiewicz |
| Notable students |
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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 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; in particular, his open problems stimulated the infinite-dimensional topology.
Borsuk received his master's degree and doctorate from Warsaw University in 1927 and 1930, respectively; his PhD thesis advisor was Stefan Mazurkiewicz. He was a member of the Polish Academy of Sciences from 1952. Borsuk's students include: Samuel Eilenberg, Andrzej Kirkor, Jan Jaworowski, Andrzej Granas, Antoni Kosiński, Karol Sieklucki, Włodzimierz Holsztyński, Rafał Molski, Hanna Patkowska, Andrzej Jankowski, Włodzimierz Kuperberg, Stanisław Spież, Krystyna Kuperberg, Jerzy Dydak, Andrzej Trybulec, Marian Orłowski, Alfred Surzycki (see https://www.genealogy.math.ndsu.nodak.edu/id.php?id=12548).