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International Journal of Approximate Reasoning
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International Journal of Approximate Reasoning
Article . 2007
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On metrization of the hit-or-miss topology using Alexandroff compactification

Authors: Guo Wei 0004; Yangeng Wang;

On metrization of the hit-or-miss topology using Alexandroff compactification

Abstract

The authors consider the hyperspace \(\mathcal F(E)\) of closed subsets of a Hausdorff topological space \(E\), endowed with the so-called Fell topology \(\tau_f\) (termed hit-or-miss topology in the paper) having subbase elements of the form \(\{A\in\mathcal F(E): A\cap U\neq\emptyset\}\) and \(\{A\in\mathcal F(E): A\cap K=\emptyset\}\), where \(U\subseteq E\) is open, and \(K\subseteq E\) is compact. The Fell topology has been extensively studied in the literature, and its various properties are well-established; in particular, \((\mathcal F(E),\tau_f)\) is always compact, and it is metrizable iff \(E\) is a locally compact 2nd countable space (HLCSC, in short). The authors provide an explicit metric for the hyperspace, if \(E\) is HLSCS, by embedding \((\mathcal F(E),\tau_f)\) into the space of nonempty closed subsets of the Alexandroff one-point compactification \(\omega E\) endowed with the Hausdorff metric topology. Note that in this case, the latter topology coincides with the so-called Vietoris topology, for which this embedding is known [see e.g. Proposition 4.5.2 in the monograph Theory of Correspondences by \textit{E. Klein} and \textit{A. Thompson} (Wiley, New York) (1984; Zbl 0556.28012)]. A comparison of the above metric to the Hausdorff-Buseman metric is given, and applications to hyperspace dynamics are discussed.

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Keywords

Alexandroff compactification, Hyperspace dynamics, Applied Mathematics, metrization, hyperspace Birkhoff ergodic theorem, Hit-or-miss topology and metrization, Hausdorff metric, Theoretical Computer Science, hyperspace dynamics, hit-or-miss topology, embedding, Artificial Intelligence, Hyperspaces in general topology, Choquet capacity, Hyperspace Birkhoff ergodic theorem, Software, Embedding

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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!
8
Average
Average
Top 10%
hybrid