scientific article

Publication date: 1983

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

Palais-Smale condition retraction mountain pass lemma sub- and super solutions nontrivial critical point retractable property

Mathematics Subject Classification ID

Nonlinear boundary value problems for linear elliptic equations (35J65) Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05)

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