【摘要】 中心焦点判定是微分方程定性理论的重要组成部分之一.本文根据后继函数法,引入焦点量的一种递推计算方法,对一类多项式系统利用M athem atica软件,求得其焦点量.并以此讨论了原点为中心的情况,给出原点为中心的判定条件.更多还原

【Abstract】 The center focus decision problem is an important part of the differential equation theory.A method to calculate focus value is introduced by using the means of successor function, and the focus value for a type of polynomial system is given with the aid of the computer algebra tool(Mathmatica).By the way,the condition that the original point is the center is analyzed and the center focus decision conditions is given.更多还原