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Nonlinear functional analysis, Nonlinear Functional Analysis, Variational methods involving nonlinear operators, critical point theory, Critical Point Theory, minimax methods, Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces, Minimax Methods, nonlinear functional analysis, Mathematics
Nonlinear functional analysis, Nonlinear Functional Analysis, Variational methods involving nonlinear operators, critical point theory, Critical Point Theory, minimax methods, Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces, Minimax Methods, nonlinear functional analysis, Mathematics
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