文章中我们讨论二阶hamilitonian系统周期解的存在性,利用鞍点定理,我们得到了一个新的二阶hamiltonion系统周期的存在性.%In this paper, we discuss the existence of periodic solutions of second-order hamilitonion system, and using saddle point theorem, we get the existence of periodic solutions of a new second-order hamiltonian system.
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