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An inequality between resolvents and determinants for operators in a Banach space

An inequality between resolvents and determinants for operators in a Banach space Abstract Let \(\mathcal {W}\) be an ideal of compact operators A in a Banach space X satisfying the condition \(N_\mathcal {W}(A)=\sum _{k=1}^{\infty }x_k(A)<\infty \), where \(x_k(A)\)\((k=1, 2, \ldots )\) are the Weyl numbers of A. It is proved that for all \(A\in \mathcal {W}\) and any regular \(\lambda \ne 0\) of A, the inequality $$\begin{aligned} \Vert \det \;(I-\lambda ^{-1}A)(\lambda I-A)^{-1}\Vert \le \frac{ c }{ |\lambda | } \exp \;\left[ \frac{ 2cN_\mathcal {W}(A) }{ |\lambda | }\right] \end{aligned}$$ is valid, where \(c=\sqrt{2e}\). Applications of this inequality to spectrum perturbations are also discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Functional Analysis Springer Journals

An inequality between resolvents and determinants for operators in a Banach space

Annals of Functional Analysis , Volume 11 (2): 12 – Apr 1, 2020

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References (34)

Publisher
Springer Journals
Copyright
2019 Tusi Mathematical Research Group (TMRG)
ISSN
2639-7390
eISSN
2008-8752
DOI
10.1007/s43034-019-00001-8
Publisher site
See Article on Publisher Site

Abstract

Abstract Let \(\mathcal {W}\) be an ideal of compact operators A in a Banach space X satisfying the condition \(N_\mathcal {W}(A)=\sum _{k=1}^{\infty }x_k(A)<\infty \), where \(x_k(A)\)\((k=1, 2, \ldots )\) are the Weyl numbers of A. It is proved that for all \(A\in \mathcal {W}\) and any regular \(\lambda \ne 0\) of A, the inequality $$\begin{aligned} \Vert \det \;(I-\lambda ^{-1}A)(\lambda I-A)^{-1}\Vert \le \frac{ c }{ |\lambda | } \exp \;\left[ \frac{ 2cN_\mathcal {W}(A) }{ |\lambda | }\right] \end{aligned}$$ is valid, where \(c=\sqrt{2e}\). Applications of this inequality to spectrum perturbations are also discussed.

Journal

Annals of Functional AnalysisSpringer Journals

Published: Apr 1, 2020

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