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Linear Algebra and its Applications
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Linear Algebra and its Applications
Article . 2015 . Peer-reviewed
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Maps preserving peripheral spectrum of generalized products of operators

Authors: Zhang, Wen; Hou, Jinchuan;

Maps preserving peripheral spectrum of generalized products of operators

Abstract

Let $\mathcal{A}_1$ and $\mathcal{A}_2$ be standard operator algebras on complex Banach spaces $X_1$ and $X_2$, respectively. For $k\geq2$, let $(i_1,...,i_m)$ be a sequence with terms chosen from $\{1,\ldots,k\}$, and assume that at least one of the terms in $(i_1,\ldots,i_m)$ appears exactly once. Define the generalized product $T_1* T_2*\cdots* T_k=T_{i_1}T_{i_2}\cdots T_{i_m}$ on elements in $\mathcal{A}_i$. Let $��:\mathcal{A}_1\rightarrow\mathcal{A}_2$ be a map with the range containing all operators of rank at most two. We show that $��$ satisfies that $��_��(��(A_1)*\cdots*��(A_k))=��_��(A_1*\cdots* A_k)$ for all $A_1,\ldots, A_k$, where $��_��(A)$ stands for the peripheral spectrum of $A$, if and only if $��$ is an isomorphism or an anti-isomorphism multiplied by an $m$th root of unity, and the latter case occurs only if the generalized product is quasi-semi Jordan. If $X_1=H$ and $X_2=K$ are complex Hilbert spaces, we characterize also maps preserving the peripheral spectrum of the skew generalized products, and prove that such maps are of the form $A\mapsto cUAU^*$ or $A\mapsto cUA^tU^*$, where $U\in\mathcal{B}(H,K)$ is a unitary operator, $c\in\{1,-1\}$.

17 pages

Related Organizations
Keywords

peripheral spectrum, standard operator algebras, preservers, Mathematics - Operator Algebras, 47B49, 47A12, 47L10, generalized products, Functional Analysis (math.FA), Mathematics - Functional Analysis, Banach spaces, Algebras of operators on Banach spaces and other topological linear spaces, Numerical range, numerical radius, FOS: Mathematics, Transformers, preservers (linear operators on spaces of linear operators), Spectrum, resolvent, Operator Algebras (math.OA)

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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!
10
Average
Top 10%
Top 10%
Green
hybrid