The existence of a continuous Z2-map from a free m-dimensional Z2-simplicial complex E to the (m - 1)-dimensional antipodal sphere S(m)-1 is characterized by means of an enumerative combinatorial criterion involving a coloring of the vertices of E. The Borsuk-Ulam theorem, 1933, and the combinatorial lemmas of Tucker, 1945, and Ky Fan, 1952, are easy consequences of this result for the case \E\ = S(m).
机构:
Department of Mathematics.University of Roma Ⅱ'Tor Vergata.Via della Ricerca Scientifica.00133 Roma.ItalyDepartment of Mathematics.University of Roma Ⅱ'Tor Vergata.Via della Ricerca Scientifica.00133 Roma.Italy
DE BLASI Francesco S.
GEORGIEV Pando Gr.
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Department of Mathematics and Informatics,Sofia,University"St.Kl.Ohridski",5 James Bourchier Blvd.,1126 Sofia.Bulgaria and Laboratory for Advanced Brain Signal Processing.Brain Science Institute.The Institute of Physical and Chemical Research(RIKEN)2-1,HirDepartment of Mathematics.University of Roma Ⅱ'Tor Vergata.Via della Ricerca Scientifica.00133 Roma.Italy