On completely Ramsey sets
Szymon Plewik (1987)
Fundamenta Mathematicae
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Szymon Plewik (1987)
Fundamenta Mathematicae
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Alessandro Fedeli (1998)
Commentationes Mathematicae Universitatis Carolinae
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The aim of this paper is to show, using the reflection principle, three new cardinal inequalities. These results improve some well-known bounds on the cardinality of Hausdorff spaces.
Z. Balogh (1978)
Fundamenta Mathematicae
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Anatoly A. Gryzlov, Dimitrina N. Stavrova (1994)
Commentationes Mathematicae Universitatis Carolinae
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Cardinal functions for topological spaces in which a subset is selected in a certain way are defined and studied. Most of the main cardinal inequalities are generalized for such spaces.
Angelo Bella, Jack R. Porter (1996)
Commentationes Mathematicae Universitatis Carolinae
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The cardinal functions of pseudocharacter, closed pseudocharacter, and character are used to examine H-closed spaces and to contrast the differences between H-closed and minimal Hausdorff spaces. An H-closed space is produced with the properties that and .