scientific article; zbMATH DE number 702892

zbMath0813.34069MaRDI QIDQ4315970

V. D. Budaev

Publication date: 31 January 1995

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zbMATH Keywords

root functionsunconditional basisnonselfadjoint differential operator

Mathematics Subject Classification ID

General theory of ordinary differential operators (47E05) Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators (34L10) Summability and bases; functional analytic aspects of frames in Banach and Hilbert spaces (46B15)

Related Items (3)

The Hilbert and Bessel properties of systems of eigenfunctions of second-order operators ⋮ A criterion for the Bessel property of systems of the form \(\{\exp (i\lambda_n t)\sin (\mu_n t)\}\) and \(\{\exp (i\lambda_n t)\cos (\mu_n t)\}\) ⋮ The Il’in Spectral Method for Determination of the Properties of the Basis Property and the Uniform Convergence of Biorthogonal Expansions on a Finite Interval

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