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On subspaces of pseudoradial spaces
Author(s):
Alan
Dow;
Jinyuan
Zhou
Journal:
Proc. Amer. Math. Soc.
127
(1999),
1221-1230.
MSC (1991):
Primary 54E35
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Abstract:
A topological space is pseudoradial if each of its non closed subsets has a sequence (not necessarily with countable length) convergent to outside of . We prove the following results concerning pseudoradial spaces and the spaces , where is an ultrafilter on : (i) CH implies that, for every ultrafilter on , is a subspace of some regular pseudoradial space. (ii) There is a model in which, for each P-point , cannot be embedded in a regular pseudoradial space while there is a point such that is a subspace of a zero-dimensional Hausdorff pseudoradial space.
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Additional Information:
Alan
Dow
Affiliation:
Department of Mathematics, York University, 4700 Keele Street, North York, Ontario Canada M3J 1P3
Email:
Alan.Dow@mathstat.yorku.ca
Jinyuan
Zhou
Affiliation:
Department of Mathematics, York University, 4700 Keele Street, North York, Ontario Canada M3J 1P3
Email:
jzhou@spicer.com
DOI:
10.1090/S0002-9939-99-04628-6
PII:
S 0002-9939(99)04628-6
Keywords:
Forcing,
CH,
ultrafilter,
zero-dimensional space,
pseudoradial
Received by editor(s):
March 17, 1997
Received by editor(s) in revised form:
July 30, 1997
Communicated by:
Carl Jockusch
Copyright of article:
Copyright
1999,
American Mathematical Society
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