Exactly two-to-one maps from continua onto arc-continua

Tom 150 / 1996

W. Dębski, J. Heath, J. Mioduszewski Fundamenta Mathematicae 150 (1996), 113-126 DOI: 10.4064/fm_1996_150_2_1_113_126

Streszczenie

Continuing studies on 2-to-1 maps onto indecomposable continua having only arcs as proper non-degenerate subcontinua - called here arc-continua - we drop the hypothesis of tree-likeness, and we get some conditions on the arc-continuum image that force any 2-to-1 map to be a local homeomorphism. We show that any 2-to-1 map from a continuum onto a local Cantor bundle Y is either a local homeomorphism or a retraction if Y is orientable, and that it is a local homeomorphism if Y is not orientable.

Autorzy

  • W. Dębski
  • J. Heath
  • J. Mioduszewski

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