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Browsing by Author "Strack, Beata"

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    Item type:Article, Access status: Open Access ,
    A note on the discrete Schrödinger operator with a perturbed periodic potential
    (Wydawnictwa AGH, 2010) Strack, Beata
    The aim of this paper is to study the spectrum of the one-dimensional discrete Schrödinger operator with a perturbed periodic potential. We obtain natural conditions under which this perturbation preserves the essential spectrum of the considered operator. Conditions on the number of isolated eigenvalues are given.