A note on nowhere dense sets in
Petr Simon (1990)
Commentationes Mathematicae Universitatis Carolinae
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Displaying similar documents to “A note on almost disjoint refinement”
A note on nowhere dense sets in
On saturated almost disjoint families
András Hajnal, István Juhász, Lajos Soukup (1987)
Commentationes Mathematicae Universitatis Carolinae
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Hausdorff gaps reconstructed from Luzin gaps
Piotr Kalemba, Szymon Plewik (2009)
Acta Universitatis Carolinae. Mathematica et Physica
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Almost disjoint families and property (a)
Paul Szeptycki, Jerry Vaughan (1998)
Fundamenta Mathematicae
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We consider the question: when does a Ψ-space satisfy property (a)? We show that if then the Ψ-space Ψ(A) satisfies property (a), but in some Cohen models the negation of CH holds and every uncountable Ψ-space fails to satisfy property (a). We also show that in a model of Fleissner and Miller there exists a Ψ-space of cardinality which has property (a). We extend a theorem of Matveev relating the existence of certain closed discrete subsets with the failure of property (a). ...