摘要
利用重合度理论中的延拓定理,讨论了一类具偏差变元高阶Lienard方程的周期解,在不需要∫T0p(t)dt=0的假设前提下,得到了周期解存在性的若干新结果,推广和改进了已有文献中的相关结论.
By using the coincidence degree theory of Mawhin, we study the existence of periodic solutions of the Lienard-type equation
x^(m) (t)+m-1∑i=1 fi(x(t-δi))x^(i) (t-δi)+g(t,x(t-τ(t)))=p(t)
with deviating argument. Some new sufficient conditions of periodic solutions are obtained ridding of the condition ∫^T 0p(t)dt=0. The results have extended or improved the related reports in the literature.
出处
《甘肃科学学报》
2007年第2期40-45,共6页
Journal of Gansu Sciences
关键词
高阶Lienard方程
偏并变元
周期解
存在性
重舍度
Lienard-type equation
deviating argument
periodic solution
existence
coincidence degree