Abstract
Variational methods are used in order to establish the existence and the multiplicity of nontrivial periodic solutions of a second order dynamical system. The main results are obtained when the potential satisfies different superquadratic conditions at infinity. The particular case of equations with a concave-convex nonlinear term is covered.
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Bonanno, G., Livrea, R. & Schechter, M. Some notes on a superlinear second order Hamiltonian system. manuscripta math. 154, 59–77 (2017). https://doi.org/10.1007/s00229-016-0903-6
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DOI: https://doi.org/10.1007/s00229-016-0903-6