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Journal of Functional Analysis
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Journal of Functional Analysis
Article . 2007
License: Elsevier Non-Commercial
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Article . 2007
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Hyperreflexivity and operator ideals

Authors: Oikhberg, Timur;

Hyperreflexivity and operator ideals

Abstract

A norm-closed subspace \(\mathcal A\subseteq B(X,Y)\) is hyperreflexive if there is a constant \(C\) such that for all \(T\in B(X,Y)\) \[ \inf_{a\in{\mathcal A}}\| T-a\|\leq C\sup\| uTv\|, \] where the supremum is taken over all finite rank contractions \(u\) and \(v\) such that \(u\mathcal A v=0\); see \textit{V.\,Müller} and \textit{M.\,Ptak} [J.~Funct.\ Anal.\ 218, No.\,2, 395--408 (2005; Zbl 1074.47032)]. In the present paper, using normed operator ideals \((\mathcal B,\beta)\), a more general definition of \textit{\(\mathcal B\)-hyperreflexivity} is given by replacing all occurrences of \(\|\cdot\|\) in the definition above by the ideal norm \(\beta\). Also, considering only subsets \({\mathcal A}\) instead of subspaces, a modification leads to the definition of \textit{\(\mathcal B\)-Azoff--Shehada hyperreflexivity}. Examples of spaces having and failing \((\mathcal B,\beta)\)-hyperreflexivity are given. In the last section, this type of hyperreflexivity is used to construct operator spaces with prescribed sets of completely bounded maps.

Related Organizations
Keywords

Operator ideals, hyperreflexivity, operator spaces, Hyperreflexivity, Operator spaces (= matricially normed spaces), Operator spaces and completely bounded maps, Operator spaces, Azoff-Shehada-hyperreflexivity, Spaces of operators; tensor products; approximation properties, Analysis, operator ideals

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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!
1
Average
Average
Average
hybrid