Geodesic
A critical point result for non-differentiable indefinite functionals
Commentationes Mathematicae Universitatis Carolinae, Tome 45 (2004) no. 4, pp. 663-679.

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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.
Classification : 35A15, 47J30, 49J35, 49J52, 58E05
Keywords: locally Lipschitz continuous and indefinite functionals; deformation lemmas; critical point theorems 
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     title = {A critical point result for non-differentiable indefinite functionals},
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Marano, Salvatore A.; Motreanu, Dumitru. A critical point result for non-differentiable indefinite functionals. Commentationes Mathematicae Universitatis Carolinae, Tome 45 (2004) no. 4, pp. 663-679. http://geodesic.mathdoc.fr/item/CMUC_2004__45_4_a7/