Conditions for nondiscreteness of lower spectra

DOI10.1016/0022-247X(79)90253-1zbMath0427.35059MaRDI QIDQ1136946

Walter Allegretto

Publication date: 1979

Published in: Journal of Mathematical Analysis and Applications (Search for Journal in Brave)

zbMATH Keywords

essential spectrumFriedrichs extensionsingular elliptic operatornondiscreteness of lower spectra

Mathematics Subject Classification ID

Spectral theory and eigenvalue problems for partial differential equations (35P99) Spectrum, resolvent (47A10) General theory of partial differential operators (47F05) Second-order elliptic equations (35J15)

Cites Work

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• A criterion for nondiscrete lower spectra
• Elliptic Operators with a Purely Continuous Spectrum
• An Abstract Oscillation Theorem

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