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    Shechter spectra and relatively demicompact linear relations
    (Maltepe Üniversitesi, 2019) Fakhfakh, Slim
    In this paper, we denote by L the block matrix linear relation, acting on the Banach space X ? Y , of the form where A, B, C and D are four linear relations with dense domains. We first try to determine the conditions under which a block matrix linear relation becomes a demicompact block matrix linear relation. Second, we study Shechter spectra using demicompact linear relations and relatively demicompact linear relations.