# 新莆京app官网下载8883登录-welcome

Restricted independence in displacement function

2022年05月11日 19:30-20:30  腾讯会议: 389-413-0022

*主持人：傅显隆 教授

*讲座内容简介：
Since the independence of focal values is a sufficient condition to give a number of limit cycles arising from a center-focus equilibrium, in this paper we consider a restricted independence to a parametric curve, which gives a method not only to increase the lower bound for the cyclicity of the center-focus equilibrium but also to be available when those focal values are not independent. We apply the method to a nondegenerate center-focus system and prove that the cyclicity reaches its an upper bound. This is a joint work with Xingwu Chen, Jaume Llibre, Zhaoxia Wang.

*主讲人简介：