A critical point result for non-differentiable indefinite functionals
Salvatore A. Marano, Dumitru Motreanu (2004)
Commentationes Mathematicae Universitatis Carolinae
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In this paper, two deformation lemmas concerning a family of indefinite, non necessarily continuously differentiable functionals are proved. A critical point theorem, which extends the classical result of Benci-Rabinowitz [14, Theorem 5.29] to the above-mentioned setting, is then deduced.