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
Link To Document :
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