再利用泛函的临界点理论，得到了方程具有周期解的充分条件。
Some sufficient conditions for the existence of periodic solutions of the equation are obtained by using the theory of critical point in functional.
通过使用临界点理论中的极大极小方法获得了两个新的存在性定理。
Two new existence theorems are obtained by the minimax methods in critical point theory.
本文利用临界点理论，建立了一类离散哈密顿系统存在多个周期解的一些充分条件。
By using critical point theory, we obtain some sufficient conditions for the existence of multiple periodic solutions to a discrete Hamiltonian system.
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