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# Subharmonic solutions for second order Hamiltonian systems

• In this paper, we are interested in the existence of subharmonic solutions for the problem $u_{t t} + G'(u) = f(t),$ where $G:R^{ N} \rightarrow R$ is not necessarily convex and $f:R \rightarrow R^N$ is periodic with minimal period $T > 0$.
Mathematics Subject Classification: 37Kxx.

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