A note on the discrete Schrödinger operator with a perturbed periodic potential
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wersja wydawnicza
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pp. 193-202
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Bibliogr. s. 201-202.
Abstract
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.