二次系统极限环的唯一性

THE UNIQUENESS OF LIMIT CYCLE FOR THE QUADRATIC SYSTEMS

本文综述二次系统极限环的唯一性的一些研究方法和结果,其中有些结果是第一次发表的.全文分3节.§1研究的方法;§2关于叶彦谦分类的一些结果;§3一些特殊类型的研究.

This is a comprehensive report for the research methods and results of the uniqueness of limit cycle of the quadratic system. Some results are published for the first time. There are three sections in this paper:§1 research methods; § 2 some results about Ye's classifications; § 3 researches on some special types.