Displaying similar documents to “Local cardinal functions of H-closed spaces”

The G δ -topology and incompactness of ω α

Isaac Gorelic (1996)

Commentationes Mathematicae Universitatis Carolinae

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We establish a relation between covering properties (e.gĿindelöf degree) of two standard topological spaces (Lemmas 4 and 5). Some cardinal inequalities follow as easy corollaries.

On the cardinality of functionally Hausdorff spaces

Alessandro Fedeli (1996)

Commentationes Mathematicae Universitatis Carolinae

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In this paper two new cardinal functions are introduced and investigated. In particular the following two theorems are proved: (i) If X is a functionally Hausdorff space then | X | 2 f s ( X ) ψ τ ( X ) ; (ii) Let X be a functionally Hausdorff space with f s ( X ) κ . Then there is a subset S of X such that | S | 2 κ and X = { c l τ θ ( A ) : A [ S ] κ } .

The sizes of relatively compact T 1 -spaces

Winfried Just (1996)

Commentationes Mathematicae Universitatis Carolinae

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The relativization of Gryzlov’s theorem about the size of compact T 1 -spaces with countable pseudocharacter is false.