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SOLUTIONS FOR DOUBLY RESONANT NONLINEAR NON-SMOOTH PERIODIC PROBLEMS

Published online by Cambridge University Press:  15 February 2005

Sophia Th. Kyritsi
Affiliation:
Department of Mathematics, National Technical University, Zografou Campus, Athens 15780, Greece ([email protected])
Nikolaos S. Papageorgiou
Affiliation:
Department of Mathematics, National Technical University, Zografou Campus, Athens 15780, Greece ([email protected])
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Abstract

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We study a nonlinear second-order periodic problem driven by the scalar $p$-Laplacian with a non-smooth potential. We consider the so-called doubly resonant situation allowing complete interaction (resonance) with both ends of the spectral interval. Using variational methods based on the non-smooth critical-point theory for locally Lipschitz functions and an abstract minimax principle concerning linking sets we establish the solvability of the problem.

AMS 2000 Mathematics subject classification: Primary 34B15; 34C25

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 2005