在这份报纸,我们与无限的延期讨论非线性的单个中立微分系统的周期的答案。由使用,矩阵措施和 Krasnoselskii 修理了点定理,我们获得了周期的答案的存在的足够的条件。
In this paper,we discuss the periodic solutions of the nonlinear singular neutral differential systems with infinite delay.By using matrix measure and Krasnoselskii's fixed point theorem,we obtained the suffcient conditions of the existence of periodic solutions.