Some base axioms for topology involving enumerability
Aull, C. E.
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Aull, C. E.
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Aull, C. E.
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H. Bennett, J. Chaber (1990)
Fundamenta Mathematicae
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H. Wicke, J. Worrell (1972)
Fundamenta Mathematicae
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Aquaro, G.
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Aleksander V. Arhangel'skii, Raushan Z. Buzyakova (2002)
Commentationes Mathematicae Universitatis Carolinae
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It is proved that if a regular space is the union of a finite family of metrizable subspaces then is a -space in the sense of E. van Douwen. It follows that if a regular space of countable extent is the union of a finite collection of metrizable subspaces then is Lindelöf. The proofs are based on a principal result of this paper: every space with a point-countable base is a -space. Some other new results on the properties of spaces which are unions of a finite collection of...