无穷时滞Liénard方程的周期解(英文)

Periodic Solutions of Lienard Equations withInfinite Delay

讨论具有无穷时滞Lienard型方程x+(α~2F（x）/αx^2)x+g(t,x_t)=p(t)的周期解问题, 利用重合度理论得到了周期解存在的充分条件.

The problem of periodic solutions for Lienard equations with infinite delay x+(?)x+g(t,xt)=p(t)is discussed by using Mawhin's,coincidence degree theory. Some new results on the existence of periodic solutions are derived.