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2014 | 227 | 2 | 97-128
Tytuł artykułu

Discrete homotopy theory and critical values of metric spaces

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Utilizing the discrete homotopy methods developed for uniform spaces by Berestovskii-Plaut, we define the critical spectrum Cr(X) of a metric space, generalizing to the non-geodesic case the covering spectrum defined by Sormani-Wei and the homotopy critical spectrum defined by Plaut-Wilkins. If X is geodesic, Cr(X) is the same as the homotopy critical spectrum, which differs from the covering spectrum by a factor of 3/2. The latter two spectra are known to be discrete for compact geodesic spaces, and correspond to the values at which certain special covering maps, called δ-covers (Sormani-Wei) or ε-covers (Plaut-Wilkins), change equivalence type. In this paper we initiate the study of these ideas for non-geodesic spaces, motivated by the need to understand the extent to which the accompanying covering maps are topological invariants. We show that discreteness of the critical spectrum for general metric spaces can fail in several ways, which we classify. The, newcomer" critical values for compact non-geodesic spaces are completely determined by the homotopy critical values and the refinement critical values, the latter of which can, in many cases, be removed by changing the metric in a bi-Lipschitz way.
Słowa kluczowe
Rocznik
Tom
227
Numer
2
Strony
97-128
Opis fizyczny
Daty
wydano
2014
Twórcy
autor
  • Department of Mathematics, University of Tennessee, Knoxville, TN 37996, U.S.A.
  • 7078 W. Rainbow Rd., Sedalia, CO 80135, U.S.A.
autor
  • Department of Mathematics, Vanderbilt University, Nashville, TN 37240, U.S.A.
autor
  • Department of Mathematics, University of Tennessee, Knoxville, TN 37996, U.S.A.
  • Department of Mathematics, Cornell University, Ithaca, NY 14853-4201, U.S.A.
autor
  • 17 Sutherland Rd., Hicksville, NY 11801, U.S.A.
autor
  • Department of Mathematics and, Computer Science, University of North Carolina at Pembroke, Pembroke, NC 28372, U.S.A.
Bibliografia
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.bwnjournal-article-doi-10_4064-fm227-2-1
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