Necessary conditions for the convergence and summability of eigenfunction expansions in the complex domain

zbMath0738.34042MaRDI QIDQ1177299

Gerhard Freiling, Walter Eberhard

Publication date: 26 June 1992

Published in: Differential and Integral Equations (Search for Journal in Brave)

zbMATH Keywords

non-selfadjoint eigenvalue problemsexpansions of given functions in terms of the eigenfunctions and associated functionsirregular problemnecessary conditions for the L2-convergence and Abel-summability

Mathematics Subject Classification ID

Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators (34L10) Ordinary differential equations in the complex domain (34M99)

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