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Hyperreflexivity of finite-dimensional subspaces

Authors: Müller, V. (Vladimír); Ptak, M.;

Hyperreflexivity of finite-dimensional subspaces

Abstract

Let \(X\) and \(Y\) be Banach spaces and let \(B(X,Y)\) denote the space of bounded linear operators. A closed subspace \(M \subset B(X,Y)\) is said to be reflexive if every \(T \in B(X,Y)\) such that \(T(x) \in Mx^-\) for every \(x\in X\) implies that \(T \in M\) (here \(Mx = \{S(x): S \in M\}\) and the closure is w.r.t. the strong operator topology). Such spaces are also called topologically reflexive spaces. \(M\) is said to be hyperreflexive if there exists a \(C>0\) such that for all \(T \in B(X,Y)\), \(\text{dist}(T,M) \leq C \sup\{\text{dist}(Tx,Mx): x \in X\), \(\| x\| = 1 \}\). Any hyperreflexive space is reflexive and when \(X,Y\) are finite-dimensional, any reflexive space is hyperreflexive. In general, these two concepts are not the same. In this very interesting paper, the authors show that any finite-dimensional reflexive subspace is hyperreflexive, answering a question of \textit{J. Kraus} and \textit{D. R. Larson} [Problem 3.9 in: Proc. Lond. Math. Soc., III. Ser. 53, 340--356 (1986; Zbl 0623.47046)].

Country
Czech Republic
Keywords

k-hyperreflexive subspaces, hyperreflexive subspace, reflexive subspaces, Hyperreflexive constant, Algebras of operators on Banach spaces and other topological linear spaces, Hyperreflexive subspace, Reflexive subspaces, Linear spaces of operators, hyperreflexive constant, \(k\)-hyperreflexive subspaces, Analysis

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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!
4
Average
Average
Average
hybrid