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About essential spectra of unbounded Jacobi matrices

We study spectral properties of unbounded Jacobi matrices with periodically modulated or blended entries. Our approach is based on uniform asymptotic analysis of generalized eigenvectors. We determine when the studied operators are self-adjoint. We identify regions where the point spectrum has no accumulation points. This allows us to completely describe the essential spectrum of these operators.

preprint2020arXivOpen access

Grzegorz Świderski Bartosz Trojan

math.SP

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Grzegorz Świderski Bartosz Trojan

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