The existence of periodic solution of singular discrete system is firstly stud - ied and theorem which periodic solutions of singular discrete system exist is given.
首次对广义离散系统的周期解的存在性进行研究，给出了广义离散系统周期解存在的判据。
By using critical point theory, we obtain some sufficient conditions for the existence of multiple periodic solutions to a discrete Hamiltonian system.
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。
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