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Article . 2008
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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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Weyl's type theorems and perturbations

Authors: AIENA, Pietro; GUILLEN J; PENA P.;

Weyl's type theorems and perturbations

Abstract

Summary: Weyl's theorem for a bounded linear operator \(T\) on complex Banach spaces, as well as its variants, a-Weyl's theorem and property (w), in general is not transmitted to a perturbation \(T + K\), even when \(K\) is a ``good'' operator, such as a commuting finite rank operator or a compact operator. Weyl's theorems do not survive either when \(K\) is a commuting quasi-nilpotent operator. In this paper, we discuss some sufficient conditions for which Weyl's theorem, a-Weyl's theorem as well as property (w) are transmitted under such kinds of perturbations.

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Italy
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Keywords

Local spectral properties of linear operators, Weyl type theorems, Fredholm theory, Perturbation theory of linear operators, local spectral theory, (Semi-) Fredholm operators; index theories, Spectrum, resolvent

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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!
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