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Strengthening upper bound for the number of critical levels of nonlinear functionals. (English) Zbl 0253.58006


MSC:

58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces
49R05 Variational methods for eigenvalues of operators
35D30 Weak solutions to PDEs
47J05 Equations involving nonlinear operators (general)

Citations:

Zbl 0252.47072