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  • 标题:Roots of mappings from manifolds
  • 本地全文:下载
  • 作者:Robin Brooks
  • 期刊名称:Fixed Point Theory and Applications
  • 印刷版ISSN:1687-1820
  • 电子版ISSN:1687-1812
  • 出版年度:2004
  • 卷号:2004
  • 期号:4
  • 页码:273-307
  • DOI:10.1155/S1687182004406093
  • 出版社:Hindawi Publishing Corporation
  • 摘要:

    Assume that f : X → Y is a proper map of a connected n -manifold X into a Hausdorff, connected, locally path-connected, and semilocally simply connected space Y , and y 0 ∈ Y has a neighborhood homeomorphic to Euclidean n -space. The proper Nielsen number of f at y 0 and the absolute degree of f at y 0 are defined in this setting. The proper Nielsen number is shown to a lower bound on the number of roots at y 0 among all maps properly homotopic to f , and the absolute degree is shown to be a lower bound among maps properly homotopic to f and transverse to y 0 . When 2$"> n > 2 , these bounds are shown to be sharp. An example of a map meeting these conditions is given in which, in contrast to what is true when Y is a manifold, Nielsen root classes of the map have different multiplicities and essentialities, and the root Reidemeister number is strictly greater than the Nielsen root number, even when the latter is nonzero.

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