Abstract
We extend a recent result of Ricceri concerning the existence of three critical points of certain non-smooth functionals. Two applications are given, both in the theory of differential inclusions; the first one concerns a non-homogeneous Neumann boundary value problem, the second one treats a quasilinear elliptic inclusion problem in the whole \({\mathbb R^N}\).
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Kristály, A., Marzantowicz, W. & Varga, C. A non-smooth three critical points theorem with applications in differential inclusions. J Glob Optim 46, 49–62 (2010). https://doi.org/10.1007/s10898-009-9408-0
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DOI: https://doi.org/10.1007/s10898-009-9408-0