考虑一类带正权的次二次位势对称方程的对称周期解的分布问题,利用相平面分析法,证明了在一定条件下对称周期解是稠密分布的.
[1] 魏兰阁. 一个Duffing方程的调和解和次调和解 [J]. 数学进展 2003.doi:10.3969/j.issn.1000-0917.2003.01.005
[2] Papini D.. Infinitely many solutions for a floquet-type BVP with superlinearity indefinite in sign [J]. Journal of Mathematical Analysis and Applications 2000, 1(1).
[3] PAPINI D, ZANOLIN F. A topological approach to superlinear indefinite boundary-value problem [J]. Topological Methods in Nonlinear Analysis 2000, 15.
[4] NAKAJIMA F. Even and periodic solution of the equation [J]. Journal of Differential Equations 1990, 83.
[5] 钱定边. 时间映射和跨共振点的Duffing方程 [J]. 中国科学A辑 1993, 23.
[6] 丁同仁. 常微分方程定性方法的应用 [M]. 北京:高等教育出版社 2004.
[7] DING Tongren, ZANOLIN F. Subharmonic solutions of second order nonlinear equations:A time-map approach [J]. Nonlinear Analysis-Theory Methods and Applications 1993, 20.