scientific article
zbMath0651.35001MaRDI QIDQ3796041
Publication date: 1982
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
estimatescritical pointsLyusternik-Shnirel'man theoryconvergence of the Ritz approximationnumber of eigenfunctionsoperators of variational type
Estimates of eigenvalues in context of PDEs (35P15) Completeness of eigenfunctions and eigenfunction expansions in context of PDEs (35P10) Nonlinear elliptic equations (35J60) Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) General theory of partial differential operators (47F05) Variational methods for second-order elliptic equations (35J20) Research exposition (monographs, survey articles) pertaining to partial differential equations (35-02)
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