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zbMath0486.35062MaRDI QIDQ3946540

Roger T. Lewis

Publication date: 1981

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

Friedrichs extension necessary and sufficient conditions for the discreteness of the spectrum

Mathematics Subject Classification ID

Boundary value problems for second-order elliptic equations (35J25) Estimates of eigenvalues in context of PDEs (35P15) Linear symmetric and selfadjoint operators (unbounded) (47B25) General theory of partial differential operators (47F05)

Related Items (1)

A criterion for discrete spectra of partial differential operators

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