构造Dulac函数的一种新方法

A New Method of Construction Dulac Function

提出一种新的Dulac函数构造方法,以几类微分方程系统不存在极限环为例,例证了该方法的实用性,并对已有的一些结论进行了优化。

A new method of construction Dulac function was proposed. And some differential equations which lack of limit cycles were taken to illustrate the usefulness of the method. At the time some conclusions were optimized.