一类二阶时滞微分方程的周期解存在性

The Existence of Periodic Solutions of the Second Order Differential Equations

本文考虑二阶时滞微分方程 x″(t) +ax′(t) +bx(t) +g(x(t-τ1) ,x′(t-τ2 ) ) =p(t)利用拓扑度和重合度理论得到了此方程至少存在一个

Using the theory of topologic degree and coincidence degree,we study the periodic solutions of a kind of second order differential equations and obtain some sufficient conditions for the existence of periodic solutions of the equations.