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Relations approximated by continuous functions in the Vietoris topology

Authors: L'. Holá; R. A. McCoy;

Relations approximated by continuous functions in the Vietoris topology

Abstract

LetX be a Tikhonov space,C(X) be the space of all continuous real- valued functions defined onX, and CL(X × R) be the hyperspace of all nonempty closed subsets ofX × R. We prove the following result: LetX be a locally connected locally compact paracompact space, and letF 2 CL(X × R). ThenF is in the closure ofC(X) in CL(X × R) with the Vietoris topology if and only if: (1) for every x 2 X,F(x) is nonempty; (2) for everyx 2X,F(x) is connected; (3) for every isolatedx 2X,F(x) is a singleton set; (4)F is upper semicontinuous; and (5)F forces local semiboundedness. This gives an answer to Problem 5.5 in (HM) and to Question 5.5 in (Mc2) in the realm of locally connected locally compact paracompact spaces.

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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!
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