Multiplicity results for periodic solutions of second order ODEs with asymmetric nonlinearities |
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Authors: | C. Rebelo F. Zanolin |
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Affiliation: | International School for Advanced Studies, via Beirut 2-4, 34013 Trieste, Italy ; Dipartimento di Matematica e Informatica, Università, via delle Scienze 208 (loc. Rizzi), 33100 Udine, Italy |
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Abstract: | We prove various results on the existence and multiplicity of harmonic and subharmonic solutions to the second order nonautonomous equation , as or where is a smooth function defined on a open interval The hypotheses we assume on the nonlinearity allow us to cover the case (or ) and having superlinear growth at infinity, as well as the case (or ) and having a singularity in (respectively in ). Applications are given also to situations like (including the so-called ``jumping nonlinearities'). Our results are connected to the periodic Ambrosetti - Prodi problem and related problems arising from the Lazer - McKenna suspension bridges model. |
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Keywords: | Periodic solutions, subharmonics, asymmetric nonlinearities, Poincaré -Birkhoff fixed point theorem |
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