摘要
Using the method of multi-parameter perturbation theory and qualitative analysis,a cubic system perturbed by degree four are investigated in this paper. After systematic analysis,it is found that the studied system can have nine limit cycles with their distributions are obtained.
Using the method of multi-parameter perturbation theory and qualitative analysis,a cubic system perturbed by degree four are investigated in this paper. After systematic analysis,it is found that the studied system can have nine limit cycles with their distributions are obtained.
出处
《上海师范大学学报（自然科学版）》
2014年第5期464-475,共12页
Journal of Shanghai Normal University(Natural Sciences)
基金
supported by the Natural Science Foundation of Shandong Province,China（No.ZR2010AZ003）
