solution of power series

A differential equation with constant coefficient is obtained by Termwise differentiation on the sum function of power series in this method, and the sum of constant series is able to be solved from the general solution of differential equation.

该方法运用逐项微分法将幂级数的收敛和函数转化为相应的常系数线性微分方程，求出微分方程的通解从而得到相应常数项级数之和。

way to find the solution of power series convergence radius

求幂级数收敛半径的方法

Using the method of combining perfect triangle series and power series to construct a trial function, and then, using the Least Squares Collocation Method, the bending solution of a free rectangular plate with circle loading on the double parameter foundation wets analyzed.

本文用完备的三角级数与幂级数相结合的方法构造试函数，用最小二乘配点法分析了双参数地基上矩形板在园形荷载作用下的弯曲解。

The solution of the interlace series type linear even differential equation of contain negative twice power function and arrangement number

负二次幂交错级数型线性齐次微分方程