摘要
文［３］曾给出了具有孤立闭分支的三次曲线共有九类．本文逐一地证明了这九类三次曲线的孤立闭分支均不同能成为二次系统的极限环。
In reference , it was proved that there were all together nine types of the cubic curves with the isolated close bifurcations. In this article, it is proved one by one that none of these isolated close bifurcations can become limit cycles of quaratic system, and a conclusion is drawn that there doesn't exist the limit cycle of cubic curve in the quardratic system.
出处
《辽宁师范大学学报（自然科学版）》
CAS
1996年第3期197-201,共5页
Journal of Liaoning Normal University:Natural Science Edition
基金
辽宁省教委高校科研项目
