摘要
本文研究一类具有两组平等积分直线的三次系统。给出了极限环不存在性的条件。给出了这样的系统可以存在极限环的例子。
In this paper,we study a Class of cubic systems with tow pair parallel integral lines, give some conditions of the nonexistencc of the limit cycle. We also give the example of such systems that can have at least a limit cycle.
出处
《哈尔滨师范大学自然科学学报》
1994年第2期7-9,共3页
Natural Science Journal of Harbin Normal University
