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On reflexivity of operators

Authors: Barria, Jose; Kim, H. W.; Pearcy, Carl;

On reflexivity of operators

Abstract

For a bounded operator T on a Hilbert space H, let \(A_ T(W_ T)\) denote the weak-star closed (WOT closed) algebra generated by T and the identity. The operator T is said to be reflexive if whenever Lat \(T\subset Lat A\) then \(A\in W(T)\). Recall that \(A_ T\) is the dual of the quotient space \(Q_ T=C_ 1(H)/_{\perp_{A_ T}}\), where \(C_ 1(H)\) is the Banach space of trace class operators. \textit{H. Bercovici, C. Foias}, and \textit{C. Pearcy} [CBMS Reg. Conf. Ser. Math. 56, XI, 108 p. (1985; Zbl 0569.47007)] have defined the properties \((B_{m,n})\) and \((\tilde B_{m,n})\). We say that \(A_ T\) has property \((B_{m,n})\) if every \(m\times n\) system \[ (1)\quad \{[L_{ij}]\in Q_ T: 1\leq i\leq m,\quad 1\leq j\leq n\} \] can be written as \([L_{ij}]=[x_ i\otimes y_ j]\) with \(x_ i\) and \(y_ j\) belonging to H. We say that \(A_ T\) has property \((\tilde B_{m,n})\) if whenever (1) has an approximate solution \([x_ i'\otimes y_ j']\) it has an exact solution \([L_{ij}]=[x_ i\otimes y_ j].\) The above properties are used in determining whether an operator is reflexive. \textit{J. A. Deddens} and \textit{P. A. Fillmore} [Linear Algebra Appl. 10, 89-93 (1975; Zbl 0301.15011)], \textit{D. W. Hadwin} and \textit{E. A. Nordgren} [J. Oper. Theory 7, 3-23 (1982; Zbl 0483.47023)], have given necessary and sufficient conditions that an algebraic operator be reflexive. In the article under review it is proved that if T is an algebraic operator such that \(A_ T\) has property \((B_{2,2})\) then T is reflexive. They also give an example to show that having property \((B_{1,2})\) does not, in general, imply the possession of the property \((\tilde B_{1,2})\), thereby settling a question raised in an earlier work.

Keywords

Banach space of trace class operators, Invariant subspaces of linear operators, algebraic operator, Abstract operator algebras on Hilbert spaces, Science, Applied Mathematics, property \((B_{m,n})\), reflexive operator, Mathematics, Analysis

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citations
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!
2
Average
Average
Average
hybrid