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Topology and its Applications
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Topology and its Applications
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Mrówka maximal almost disjoint families for uncountable cardinals

Authors: Dow, Alan; Vaughan, Jerry E.;

Mrówka maximal almost disjoint families for uncountable cardinals

Abstract

Let \(\kappa\) be an infinite cardinal number. For any almost disjoint family \(\mathcal{A}\subset [\kappa]^{\omega}\) let \(\psi(\kappa,\mathcal{A})\) denote the space \(\kappa\cup\mathcal{A}\) with the topology having as a base all singletons \(\{\alpha\}\) for \(\alpha \mathfrak c\), and every \(\mathcal M \subset [\kappa]^{\omega}\), it is always the case that \(|\beta \psi (\kappa, \mathcal M) \setminus \psi (\kappa, \mathcal M)| \neq 1\), yet there exists a special free \(z\)-ultrafilter \(p\) on \(\psi (\kappa, \mathcal M)\) retaining some of the properties of \(p_{0}\). In particular both \(p\) and \(p_{0}\) have a clopen local base in \(\beta \psi \) (although \(\beta \psi (\kappa, \mathcal M)\) need not be zero-dimensional). A result for \(k > \mathfrak c\), that does not apply to \(p_{0}\), is that for certain \(\kappa > \mathfrak c, p\) is a P-point in \(\beta \psi \).''

Keywords

Continuous real-valued functions, cardinal numbers, almost disjoint families, Cardinal numbers, Axiom of choice and related propositions, Mrówka-Isbell \(\varPsi \)-spaces, continuous real-valued functions, Countable cofinality, Mrówka–Isbell Ψ-spaces, countable cofinality, Counterexamples in general topology, Real-valued functions in general topology, Stone-Čech compactification, Almost disjoint families, Geometry and Topology, Stone–Čech compactification

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
12
Average
Top 10%
Average
hybrid