PERTURBATION THEORY, M-ESSENTIAL SPECTRA OF OPERATOR MATRICES

Boulbeba Boulbeba Abdelmoumen, Sonia Yengui

Abstract


In this paper, we will establish some results on perturbation theory of block
operator matrices acting on Xn, where X is a Banach space. These results are exploited to investigate the M-essential spectra of a general class of operators dened by a 3 3 block operator matrix acting on a product of Banach spaces X3.

 


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