By suing coincide degree theory, this paper discusses the existence of periodic solution for a kind of differential equation with several delays.

利用重合度理论讨论一类多个时滞微分方程的周期解的存在性。

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Firstly sufficient conditions for the existence of periodic solution are obtained by comparison theory of reaction-diffusion differential equations;

利用反应扩散方程的比较原理给出了系统存在周期解的充分条件。

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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。

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