Ring epimorphisms and .
Barr, Michael, Burgess, W. D., Raphael, R. (2003)
Theory and Applications of Categories [electronic only]
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Displaying similar documents to “Compactifications, and ring epimorphisms.”
Ring epimorphisms and .
On essential ring embeddings and the epimorphic hull of .
Raphael, R., Woods, R.G. (2005)
Theory and Applications of Categories [electronic only]
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Tightness and resolvability
Angelo Bella, Viacheslav I. Malykhin (1998)
Commentationes Mathematicae Universitatis Carolinae
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We prove resolvability and maximal resolvability of topological spaces having countable tightness with some additional properties. For this purpose, we introduce some new versions of countable tightness. We also construct a couple of examples of irresolvable spaces.
Closed embeddings into complements of -products
Aleksander V. Arhangel'skii, Miroslav Hušek (2008)
Commentationes Mathematicae Universitatis Carolinae
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In some sense, a dual property to that of Valdivia compact is considered, namely the property to be embedded as a closed subspace into a complement of a -subproduct of a Tikhonov cube. All locally compact spaces are co-Valdivia spaces (and only those among metrizable spaces or spaces having countable type). There are paracompact non-locally compact co-Valdivia spaces. A possibly new type of ultrafilters lying in between P-ultrafilters and weak P-ultrafilters is introduced. Under Martin...
Small subsets of first countable spaces
Eric van Douwen, Michael Wage (1979)
Fundamenta Mathematicae
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Distinguishing Lindelöfness and inverse Lindelöfness
Viacheslav I. Malykhin (1995)
Commentationes Mathematicae Universitatis Carolinae
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On a Hausdorff inverse Lindelöf non Lindelöf topology has been constructed.