On Relative essential spectra of a 3 x 3 Operator Matrix involving relative generalized weak demicompactness

Imen Ferjani, Aref Jeribi, Bilel Krichen

Abstract


In this paper, we investigate the relative essential spectra of a 3 x 3 block
matrix operator with unbounded entries and with domain consisting of vectors satisfying
certain relations between their components. Our results are formulated in term of relative
generalized weak demicompactness and measure of non-strict-singularity


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