Perturbation results in the Fredholm theory and M-essential spectra of some matrix operators

Boulbeba Boulbeba Abdelmoumen, Maher Mnif, Sadok Chakroun

Abstract


In this paper, we will use some new properties of
non-compactness measure, in order to establish a description of the
M-essential spectrum for some matrix operators on a Banach spaces.


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