摘要
利用度理论研究两类高阶Duffing方程周期解的存在性,改进了一些已有结果.
In this Paper, the exltence of periodic solutions for two high order Duffing equations is studied by using degree theory and some known results are improved.
出处
《邵阳学院学报（自然科学版）》
2005年第4期4-6,共3页
Journal of Shaoyang University：Natural Science Edition
关键词
高阶DUFFING方程
周期解
拓扑度
high order Duffing euqations
periodic soulutions
topological degree.
