摘要
本文研究了二次微分系统Ⅰ类方程dx/dt=-y+δx+lx2+mxy+ny2,dy/dt=x的极限环问题,得到了当lι≠0时大范围内存在极限环的条件.
In this paper, the problem on limit cycles of Type I equation of quadratic differential systems dx/dt=-y+δx+lx2+mxy+ny2, dx/dt=x has been researched.It obtained the existential condition of limit cycles on large range when l≠0.
出处
《数学学报(中文版)》
SCIE
CSCD
北大核心
1999年第1期55-60,共6页
Acta Mathematica Sinica:Chinese Series
基金
国家自然科学基金