New Characterizations of the Jeribi Essential Spectrum

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DOI: https://doi.org/10.28924/2291-8639-21-2023-109
Published: Oct 4, 2023
Cite as:
Belabbaci Chafika, New Characterizations of the Jeribi Essential Spectrum, Int. J. Anal. Appl., 21 (2023), 109.

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Belabbaci Chafika

Abstract

In this paper, we give several characterizations of the Jeribi essential spectrum of a bounded linear operator defined on a Banach space by using the notion of almost weakly compact operators. As a consequence, we prove the stability of the Jeribi essential spectrum under compact perturbations. Furthermore, some characterizations of the Jeribi essential spectra of 3×3 upper triangular block operator matrix are also given.

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References

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