摘要
给出关于二次系统极限环唯一性的判别条件,所用的方法与常见的不同,它是先通过非奇异线性变换将所给系统变为新的二次系统,然后寻求新系统具有一条积分直线的条件,从而得到唯一性判别法.
In this paper,we consider the quadratic system A uniqueness criterion of limit cycle of (*) is obtained with the integral straight line, it is writen asTheorem Suppose the following two equations have common roots, then (* ) has at most one limit cycle.
关键词
二次系统
积分直线
极限环
唯一性
quadratic system
integral straight line
limit cycle
uniqueness