Dulac函数在E_2系统中的两点应用

TWO APPLICATIONS OF DULAC FUNCTION TO E_2 SYSTEMS

我们应用 Dulac 函数建立了 E_2系统中不存在闭轨线和奇异闭轨线的两个定理。

In this paper,with the help of Dulac function on E_2 systems,two theorems of non-existence about close orbit and Singnlar close orbit are established.