三阶泛函微分方程的周期解

Periodic Solutions of Third Order Functional Differential Equations

利用Brouwcr度理论得到了泛函微分方程存在2π周期解的充分性条件,推广了文[1]中的有关结果.

In this paper, by using Brouwer degree theory, we obtain a sufficient condition of the existence of periodic solutions for the functional differential equations The result extends the related theorem in [1].