• Title of article

    The category of S(α)-spaces is not cowellpowered

  • Author/Authors

    Dikranjan، نويسنده , , Dikran and Watson، نويسنده , , Stephen، نويسنده ,

  • Issue Information
    دوماهنامه با شماره پیاپی سال 1995
  • Pages
    14
  • From page
    137
  • To page
    150
  • Abstract
    We introduce separation axioms S[η] depending on arbitrary order types η, such that for infinite ordinals α, S[α] = S(α) as introduced by Porter and Votaw. The order types η such that S[η] is cowellpowered are characterized. In particular S(α) is non-cowellpowered for each ordinal α > 1. This generalizes the known results for finite α (Dikranjan, Giuli and Tholen, 1989 and Schröder, 1983). In this case our construction is much simpler than those in Dikranjan, Giuli and Tholen, 1989 and Schröder, 1983.
  • Keywords
    Indecomposable ordinal , Cowellpowered category , ?-separated space , Epimorphism , closure operator , ?-closure , Order type , S(?)-space , Idempotent order type
  • Journal title
    Topology and its Applications
  • Serial Year
    1995
  • Journal title
    Topology and its Applications
  • Record number

    1578546