Abstract
We consider a nonlinear, nonhomogeneous Robin problem with an indefinite potential and a nonsmooth primitive in the reaction term. In fact, the right-hand side of the problem (reaction term) is the Clarke subdifferential of a locally Lipschitz integrand. We assume that asymptotically this term is resonant with respect the principal eigenvalue (from the left). We prove the existence of three nontrivial smooth solutions, two of constant sign and the third nodal. We also show the existence of extremal constant sign solutions. The tools come from nonsmooth critical point theory and from global optimization (direct method).
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Acknowledgements
The authors wish to thank the two anonymous reviewers and the Editor-in-Chief for their corrections and remarks. This research was supported by the Slovenian Research Agency Grants P1-0292, J1-8131, and J1-7025. V. D. Rădulescu acknowledges the support through a grant of the Ministry of Research and Innovation, CNCS–UEFISCDI, Project number PN-III-P4-ID-PCE-2016-0130, within PNCDI III.
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Papageorgiou, N.S., Rădulescu, V.D. & Repovš, D.D. Nonhomogeneous Hemivariational Inequalities with Indefinite Potential and Robin Boundary Condition. J Optim Theory Appl 175, 293–323 (2017). https://doi.org/10.1007/s10957-017-1173-5
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DOI: https://doi.org/10.1007/s10957-017-1173-5
Keywords
- Locally Lipschitz function
- Clarke subdifferential
- Resonance
- Extremal constant sign solutions
- Nodal solutions
- Nonlinear nonhomogeneous differential operator