A criterion for the Bessel property of a system of root functions of a quadratic pencil of differential operators.

Publication date: 15 June 2004

Published in: Doklady Mathematics (Search for Journal in Brave)

spectral parameter Bessel property quadratic pencil

General theory of ordinary differential operators (47E05) Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators (34L10)

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