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Article . 2008
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Pseudometrizable bornological convergence is Attouch-Wets convergence

Authors: Beer, G; LEVI, SANDRO;

Pseudometrizable bornological convergence is Attouch-Wets convergence

Abstract

Let \(\mathcal S\) be an ideal of subsets of a metric space \((X,d)\). A net of subsets \((A_\lambda)_\lambda\) of \(X\) is called \(\mathcal S\)-convergent to a subset \(A\) of \(X\) if for each \(S\in {\mathcal S}\) and each \(\varepsilon > 0\), we have eventually \(A\cap S\subset A^\varepsilon_\lambda\) and \(A_\lambda\cap S\subset A^\varepsilon\). Here \(A^\varepsilon\) is the \(\varepsilon\) enlargement of \(A\). Attouch-Wets convergence is an example of \({\mathcal S}\)-convergence, for suitable \(\mathcal S\). The authors identify necessary and sufficient conditions for \({\mathcal S}\)-convergence to be admissible and topological on the power set of \(X\). They prove for example that for an ideal \({\mathcal S}\) in a metric space \((X,d)\) the conditions \(\mathcal S\)-convergence is topological and \(\mathcal S\) is stable under small enlargements are equivalent. From this it follows that if \((X,d)\) is not discrete, and \(\mathcal S\) is the ideal of nowhere dense subsets of \(X\), then \(\mathcal S\)-convergence is not topological on \({\mathcal P}(X)\). Another interesting result is that if \(\mathcal S\) is a bornology in \((X,d)\), then the statements \(({\mathcal S},d)\)-convergence is compatible with a pseudometrizable topology, \(\mathcal S\) is stable under small enlargements and has a countable base, and there exists an equivalent metric \(\varrho\) for \(X\) such that \(({\mathcal S},d)\)-convergence on \({\mathcal P}(X)\) is Attouch-Wets convergence with respect to \(\varrho\), are equivalent.

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Italy
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Keywords

bornology, Bornological convergence, Attouch-Wets convergence, hyperspace, bornology, bounded Hausdorff convergence, Metric spaces, metrizability, hyperspace, Hyperspaces in general topology, Attouch-Wets convergence, Bornologies and related structures; Mackey convergence, etc., bornological 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!
0
Average
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