摘要
证明了三次Ｌｉｅｎａｒｄ系统的细焦点的阶数至多为二，从而在同一细焦点外围至多有两个极限环且可以有两个局部极限环。
In this paper, the order of the local focus of the cubic system is proved not more than two. then there exist not more than two local limit cycles surrounding the same local focus and the case of two local limit cycles is in existence.
出处
《曲阜师范大学学报（自然科学版）》
CAS
1998年第1期23-26,共4页
Journal of Qufu Normal University(Natural Science)
基金
山东省自然科学基金
