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Discrete density number

Alan Dow ⟨adow@charlotte.edu⟩

Abstract:

A subset D is a discretely dense subset of a space X if every point of X is in the closure of a discrete subset of D. The cardinal invariant, Dd(X), was introduced by Juhasz and is the minimum cardinality of a discretely dense subset of X. We are reporting on some recent work with Juhasz and van Mill on results that improve upon the, seemingly only, obvious inequalities d(X)Dd(X)|X|. We also consider, Fd(X), the free sequence density number.

Scheduled for: 2025-03-06 10:40 AM: Alan Dow in Forbes 2070C

Status: Accepted

Collection: Set-Theoretic Topology

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