摘要
本文利用二次系统初等奇点的性质及等倾线图，给出一类二次系统存在双细鞍点的充要条件。
In this paper, the necessary and sufficient conditions for a kind of quadratic differential system to exist two weak saddles are given by using properties of primary singular point in the quadratic differential system and its equiinclined line diagram.Then we construct some numerical examples for some complex coefficient conditions.
出处
《安徽大学学报（自然科学版）》
CAS
1997年第1期14-20,共7页
Journal of Anhui University(Natural Science Edition)
关键词
二次系统
存在性
充要条件
等倾线图
细鞍点
quadratic differential system ,primary singular point,equiinclined line diagram ,weak saddle
