Abstract
This is a largely expository account of various aspects of the Borsuk–Ulam theorem, including extensions of the classical theorem to families of maps parametrized by a base space and to multivalued maps. The main technical tool is the Euler class with compact supports.
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To Kazimierz Gęba
Sadly, Jan Jaworowski died before this article reached its final form. Building on Jan’s work extending over almost sixty years on various extensions of the Borsuk–Ulam theorem, this paper is presented now as a tribute to his many contributions to the theory. Jan’s first publication was a joint paper with K. Borsuk. It is a privilege for me to be the coauthor of his last paper. The responsibility for the final version, especially for any errors, is mine; had it been produced by Jan, it would certainly have been better written. MCC.
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Crabb, M.C., Jaworowski, J. Aspects of the Borsuk–Ulam theorem. J. Fixed Point Theory Appl. 13, 459–488 (2013). https://doi.org/10.1007/s11784-013-0130-7
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DOI: https://doi.org/10.1007/s11784-013-0130-7