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Set-Theoretic Topology

Alan Dow

Subevent of Set-Theoretic Topology - Thurs. AM

Forbes 2070C

Eastern Time (US & Canada)

Starts at: 2025-03-06 10:40AM

Ends at: 2025-03-06 11:00AM

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.

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