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Topology and its Applications
Article
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Topology and its Applications
Article . 1986
License: Elsevier Non-Commercial
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Topology and its Applications
Article . 1986 . Peer-reviewed
License: Elsevier Non-Commercial
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Article . 1986
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The pseudoweights of a space

Authors: Scott, Brian M.;

The pseudoweights of a space

Abstract

Let X be a \(T_ i\)-space, \(i\leq 2\). We define the \(T_ i\)-pseudoweight of X, \(\psi_ i(X)\), to be the least weight of a coarser \(T_ i\) topology on X. \textit{G. M. Reed} and \textit{P. L. Zenor} [Bull. Am. Math. Soc. 80, 879-880 (1974; Zbl 0293.54026)] have shown that if X is a Moore space, and \(| X| \leq 2^{\omega}\), then \(\psi_ 1(X)=\omega\), but there is a Moore space, X, such that \(\psi_ 2(X)=w(X)=| X| =\omega_ 1\). Theorem 1: If X is metric, \(\psi_ 0(X)=\psi_ 2(X)=\log w(X)\), where log \(\kappa\) \(=\min \{\lambda: 2^{\lambda}\geq \kappa \}\). Theorem 2: If X is compact and \(T_ 2\), then \(\psi_ 1(X)=\psi_ 2(X)=w(X)\) (but it is possible to have \(\psi_ 0(X)=\log w(X)

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Keywords

Lindelöf degree, density, linearly ordered topological space (LOTS), Linearly ordered topological spaces, generalized ordered spaces, and partially ordered spaces, linearly ordered topological space, spread, generalized ordered space (GO-space), weight, cellularity, \(T_ i\)-pseudoweight, point-separating open cover, Cardinality properties (cardinal functions and inequalities, discrete subsets), Geometry and Topology, pseudoweight, pseudocharacter, height

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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!
0
Average
Average
Average
hybrid