Variations on a theorem of Lusternik and Schnirelmann

  • Aarts J
  • Fokkink R
  • Vermeer H
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Abstract

A FIXED-POINT free map f : X → X is said to be colorable with k colors if there exists a closed cover ℓ of X consisting of k elements such that C∩f(C) = ∅ for every C in ℓ. It is shown that each fixed-point free involution of a paracompact Hausdorff space X with dim X ≤ n can be colored with n + 2 colors. Each fixed-point free homeomorphism of a metrizable space X with dim X ≤ n is colorable with n + 3 colors. Every fixed-point free continuous selfmap of a compact metrizable space X with dim X ≤ n can be colored with n + 3 colors. Copyright © 1996 Elsevier Science Ltd.

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Authors

  • Jan M. Aarts

  • Robbert J. Fokkink

  • Hans Vermeer

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