摘要
本文从多方面改进了比较发散量积分法,利用这新方法给出了Lienard系统 极限环唯二性与唯一性的一些比以前更有效的判定条件.
In this paper, the method of comparision integral of divergence is improved in many ways. By this new method we give some more effective conditions which judge that the Lienard system has at most one or two limit cycles.
出处
《数学学报(中文版)》
SCIE
CSCD
北大核心
2000年第3期463-470,共8页
Acta Mathematica Sinica:Chinese Series
基金
山东省自然科学基金