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Periodica Mathematica Hungarica
Article . 1993 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
zbMATH Open
Article . 1993
Data sources: zbMATH Open
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Almost uniform convergence

Authors: Ewert, J.;

Almost uniform convergence

Abstract

A net \((f_ n)\) of functions on a topological space \(X\) to a uniform space \((Y,{\mathcal U})\) converges almost uniformly to a function \(f\) at \(x_ 0\in X\) if for each \(U\in{\mathcal U}\) there exists a neighborhood \(W\) of \(x_ 0\) such that eventually \((f_ n(x),f(x))\in U\) for each \(x\in W\). Clearly almost uniform convergence lies between uniform convergence and quasi-uniform convergence. The author shows that if \(X\) is Hausdorff, then almost uniform convergence coincides with quasi-uniform convergence if and only if \(X\) is discrete. A paracompact Tykhonov space \(X\) is compact if and only if uniform convergence and almost convergence coincide. A Tykhonov space \(X\) is locally compact if and only if uniform convergence on compacta equals almost uniform convergence. The author also provides suitable examples. (Reviewer's remarks: In Corollary 2-3 read paracompact for compact. For related work see [\textit{A. Di Concilio} and the reviewer, Monatsh. Math. 103, 93-102 (1987; Zbl 0607.54013)] and [the reviewer, Czech. Math. J. 37(112), 608-612 (1987; Zbl 0647.54003)].

Related Organizations
Keywords

Function spaces in general topology, Compactness, Uniform structures and generalizations, Convergence in general topology (sequences, filters, limits, convergence spaces, nets, etc.), almost uniform convergence, quasi-uniform convergence

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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!
4
Average
Top 10%
Average
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