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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(e) ISSN 0002-9939(p)

     

Reflecting point-countable families

Author(s): Zoltan T. Balogh
Journal: Proc. Amer. Math. Soc. 131 (2003), 1289-1296.
MSC (2000): Primary 54E35, 54A35, 54D20
Posted: July 25, 2002
MathSciNet review: 1948122
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Abstract | References | Similar articles | Additional information

Abstract: It is shown that if every $\leq \omega _{1}$-sized subspace of a (regular) space $X$ of density $\leq \omega _{1}$ has a point-countable base, then so does $X$. Similar results hold for meta-Lindelöfness. Dow's reflection theorem and a number of other results are deduced as corollaries and applications.


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A. Dow, An empty class of nonmetric spaces, Proc. Amer. Math. Soc. 104 (1988), 999-1001. MR 89j:54032

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K. Kunen, Set theory, North-Holland, 1980. MR 82f:03001; Reprint MR 85e:03003

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K. Kunen and J.E. Vaughan, eds., Handbook of Set-theoretic Topology, North-Holland, 1984. MR 85k:54001

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S. Shelah, Remarks on $\lambda $-collectionwise Hausdorff spaces, Topology Proc. 2 (1977), 583-592. MR 81f:03060

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J.E. Vaughan, On Dow's reflection theorem for metrizable spaces, Topology Proc. 22 (1997), 351-361. MR 99m:54018


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Additional Information:

Zoltan T. Balogh
Affiliation: Department of Mathematics & Statistics, Miami University, Oxford, Ohio 45056
Email: baloghzt@muohio.edu

DOI: 10.1090/S0002-9939-02-06621-2
PII: S 0002-9939(02)06621-2
Keywords: Point-countable, reflection
Received by editor(s): July 31, 2001
Received by editor(s) in revised form: November 2, 2001
Posted: July 25, 2002
Communicated by: Alan Dow
Copyright of article: Copyright 2002, American Mathematical Society




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