Discrete spectra for some complex infinite band matrices

Under suitable assumptions the eigenvalues for an unbounded discrete operator \(A\) in \(l_2\), given by an infinite complex band-type matrix, are approximated by the eigenvalues of its orthogonal truncations. Let \[\Lambda (A)=\{\lambda \in {\rm Lim}_{n\to \infty} \lambda _n : \lambda _n \text{ i...

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Autor principal: Maria Malejki
Formato: article
Lenguaje:EN
Publicado: AGH Univeristy of Science and Technology Press 2021
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Acceso en línea:https://doi.org/10.7494/OpMath.2021.41.6.861
https://doaj.org/article/352e3db55dc74e42a73b119562036eb7
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