特殊函数——欧拉(Euler)积分和贝塞尔(Bessel)函数 1、欧拉(Euler)积分Γ函数在微分方程的解中是没有的。但是,在解微分方程的过程中会出现的。因此,首先把Γ函数作为一个特殊函数来叙述一下,并把与Γ函数成姊妹关系的β函数一并说明。这两个函数都可用Euler积分作为定义,β函数称为第一类Euler积分,Γ函数称为第二类 Special Functions - Euler Integral and Bessel Functions 1. The Euler integral Γ function is absent in the solution of differential equations. However, it appears during the process of solving differential equations. Therefore, the Γ function is first described as a special function, and the β function, which is a sister relationship with the Γ function, is described. Both of these functions can be defined as Euler integrals, beta functions as Euler integrals of the first kind, gamma functions as the second type