Karol Borsuk

Karol Borsuk
Born	May 8, 1905 Warsaw, Poland, Russian Empire
Died	January 24, 1982 (aged 76) Warsaw, Poland
Nationality	Polish
Fields	Mathematics
Alma mater	Warsaw University
Doctoral advisor	Stefan Mazurkiewicz
Notable students	Samuel Eilenberg Jan Jaworowski Krystyna Kuperberg Włodzimierz Kuperberg Andrzej Trybulec
Known for	Borsuk's conjecture Borsuk–Ulam theorem

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 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, Jan Jaworowski, Krystyna Kuperberg, Włodzimierz Kuperberg, and Andrzej Trybulec.

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.

Works

• Geometria analityczna w n wymiarach (1950) (translated to English as Multidimensional Analytic Geometry, Polish Scientific Publishers, 1969)
• Podstawy geometrii (1955)
• Foundations of Geometry (1960) with Wanda Szmielew, North Holland publisher^[1]
• Theory of Retracts (1967), PWN, Warszawa.
• Theory of Shape (1975)
• Collected papers vol. I, (1983), PWN, Warszawa.

References

1. Freudenthal, H. (1961). "Review: Foundations of geometry, Euclidean and Bolyai-Lobachevskian geometry, projective geometry. By K. Borsuk and Wanda Szmielew. Revised English translation." (PDF). Bull. Amer. Math. Soc. 67 (4): 342–344. doi:10.1090/s0002-9904-1961-10606-x.

External links

• O'Connor, John J.; Robertson, Edmund F., "Karol Borsuk", MacTutor History of Mathematics archive, University of St Andrews.
• Karol Borsuk at the Mathematics Genealogy Project