Some estimates for nonorthonormalized fundamental systems of functions of the Laplace operator.

zbMath1048.35043MaRDI QIDQ1432528

M. A. Soldatova

Publication date: 15 June 2004

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

zbMATH Keywords

spectrumLaplace operatorParseval equalityorthonormalityfundamental functions system

Mathematics Subject Classification ID

Completeness of eigenfunctions and eigenfunction expansions in context of PDEs (35P10) General theory of partial differential operators (47F05) Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation (35J05)

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