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Spaces of continuous functions, Σ -products and Box Topology

J. Angoa, Angel Tamariz-Mascarúa (2006)

Commentationes Mathematicae Universitatis Carolinae

For a Tychonoff space X , we will denote by X 0 the set of its isolated points and X 1 will be equal to X X 0 . The symbol C ( X ) denotes the space of real-valued continuous functions defined on X . κ is the Cartesian product κ with its box topology, and C ( X ) is C ( X ) with the topology inherited from X . By C ^ ( X 1 ) we denote the set { f C ( X 1 ) : f can be continuously extended to all of X } . A space X is almost- ω -resolvable if it can be partitioned by a countable family of subsets in such a way that every non-empty open subset of X has a non-empty...

Spaces with large relative extent

Yan-Kui Song (2007)

Czechoslovak Mathematical Journal

In this paper, we prove the following statements: (1) For every regular uncountable cardinal κ , there exist a Tychonoff space X and Y a subspace of X such that Y is both relatively absolute star-Lindelöf and relative property (a) in X and e ( Y , X ) κ , but Y is not strongly relative star-Lindelöf in X and X is not star-Lindelöf. (2) There exist a Tychonoff space X and a subspace Y of X such that Y is strongly relative star-Lindelöf in X (hence, relative star-Lindelöf), but Y is not absolutely relative star-Lindelöf...

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