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Wijsman convergence in the hyperspace of a metric space

Authors: Lechicki, A; LEVI, SANDRO;

Wijsman convergence in the hyperspace of a metric space

Abstract

Let (X,d) be a metric space with metric d. This paper studies Wijsman convergence (w-convergence for short) in 2 x, the power set of X, and \(2_ 0\) X the subfamily of non-empty subsets of X, as well as the hyperspace c(X), which is the set of all closed subsets of X and \(C_ 0(X)\) the set of all non-empty closed subsets of X. The paper first describes uniformities U and V for 2 2 and \(2\) \(x_ 0\) which are compatible with w-convergence on X and proceed to describe: an explicit pseudo-metric \(\alpha_ x\) on 2 x for each \(x\in X\) and shows that (1) U is generated by the continuous family of pseudo-metric \(\{\alpha_ x:\) \(x\in X\}\), (2) (2 x,U) is totally bounded, (3) \((2\) \(X_ 0,V)\) is totally bounded iff d is totally bounded and lastly, (4) if X is a separable metric space, then \[ d(A,B)=\sum^{\infty}_{k=1}\frac{1}{2\quad k}\alpha_ k(A,B) \] is a metric on C(X), where \(\alpha_ k\) is the continuous pseudo-metric as in (1) above corresponding to the element \(x_ k\) of a countable dense set \(\{x_ k\}\) in X, and \(\alpha\) generates the uniformity U. Two explicit metrics \(\beta\) and \({\tilde \beta}\), which are compatible with the uniformity V on \(C_ 0(X)\), for a separable metric space X, are also defined and the following three are shown to be equivalent (1) \((C_ 0(X),{\tilde \beta})\) is boundedly compact, (2) \((C_ 0(X),V)\) is complete, (3) (X,d) boundedly compact.

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Italy
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Keywords

Wijsman convergence, net convergence, Vietoris topology, boundedly compact space, Convergence in general topology (sequences, filters, limits, convergence spaces, nets, etc.), boundedly compact metric space, uniformity, Kuratowski convergence, Hyperspace; Vietoris hypertopology; Hausdorff hypertopology; Wijsman hypertopology; compact space; relatively compact subspace; locally compact space, completeness, Uniform structures and generalizations, Metric spaces, metrizability, Hyperspaces in general topology, continuous pseudo-metric

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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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