非自治Liénard型系统的周期解

Periodic solutions of a non-autonomous Liénard system

利用 Mawhin的重合度理论及 Brousk定理给出了一类非自治二阶微分系统周期解存在的一些充分条件 。

In this paper, sufficient conditions of the existence of periodic solutions for a second order non\|autonomous differential system are given by using the Mawhin's coincidence degree theory and Brousk Theorem.These results extend and improve the corresponding results in literature.$$$$