摘要
给出了存在两个有界分界线环的二次系统的例子，并画出相应的全局相图．
in this parer,the author takes an example of quadratic system with twobounded separatrix cycles,and draw's its global portraits.The example answers theopen question asked by Pro.Ye Yanqian in 1989.
出处
《辽宁师范大学学报（自然科学版）》
CAS
1994年第3期191-194,共4页
Journal of Liaoning Normal University:Natural Science Edition
关键词
极限环
分界线环
二次系统
limit cycle,separatrix cycle,rotated vector field,global portraits
