A nonlinear periodic system with nonsmooth potential of indefinite sign
Michael E. Filippakis, Nikolaos S. Papageorgiou (2006)
Archivum Mathematicum
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In this paper we consider a nonlinear periodic system driven by the vector ordinary -Laplacian and having a nonsmooth locally Lipschitz potential, which is positively homogeneous. Using a variational approach which exploits the homogeneity of the potential, we establish the existence of a nonconstant solution.