On dense subsets of rational numbers

Jacek Cichoń

Displaying similar documents to “On dense subsets of rational numbers”

Absolute points in $β N ∖ N$

Anna Kucia, Andrzej Szymański (1976)

Czechoslovak Mathematical Journal

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Covering of a space by nowhere dense sets

Petr Simon (1977)

Commentationes Mathematicae Universitatis Carolinae

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A note on nowhere dense sets in $ω^{*}$

Petr Simon (1990)

Commentationes Mathematicae Universitatis Carolinae

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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 $| A | < p$ 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 $p$ which has property (a). We extend a theorem of Matveev relating the existence of certain closed discrete subsets with the failure of property (a). ...

A note on almost disjoint refinement

Petr Simon (1996)

Acta Universitatis Carolinae. Mathematica et Physica

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Displaying similar documents to “On dense subsets of rational numbers”

Absolute points in β N ∖ N

Covering of a space by nowhere dense sets

A note on nowhere dense sets in ω *

Almost disjoint families and property (a)

A note on almost disjoint refinement

Absolute points in $β N ∖ N$

A note on nowhere dense sets in $ω^{*}$