一类具有一个零特征根的25次结点的全局结构

A class of fifth systems on the plane with one finite singular point of twenty - fiveth order

本文讨论一类平面五次系统的全局结构,给出高次奇点的性质以及极限环存在的条件。

In this paper, we study a class of fifth systems with one finite singular point of twenty - fiveth order, and give some conditions of existence and nonexistence of the limit cycle.