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《Journal of Zhengzhou University(Natural Science Edition)》 2008-01
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Existence of Periodic Solutions for a Kind of High Order Liénard Equations

WANG Yi-gao,LU Shi-ping(College of Mathematics and Computer Science,Anhui Normal University,Wuhu 241000,China)  
Existence of periodic solutions for a kind of high order Liénard equations x(n)(t)+f(x(t))x′(t)+g(x(t-τ(t,x(t))))=p(t) is studied,and some new results are obtained.The known results in the literature are improved.The result shows the influence of the lag on the existence of periodic solutions.
【Fund】: 国家自然科学基金资助项目 编号10371006;; 安徽省自然科学基金资助项目 编号050460103;; 安徽省教育厅重点基金资助项目 编号2005kj031ZD
【CateGory Index】: O175
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