Green Functions for Time- Dependent Problems 标准的做法是:考虑到方程是一个非齐次方程, 所以将 Creen函数按相应齐次问题本征函数展开 采用平面极坐标系,坐标原点放在圆心Green Function of Helmholtz Eq ... Green Functions for Time-Dependent Problems Separation of Variables Method of Images IO‰{´µÄ§´‡šàg§§ ¤±òGreen¼êUƒAàg¯K¼êÐm æ^²¡4‹IX§‹I:3% G(r; r 0 ) =R0(r) + X ∞ m=1 Rm1(r) cos mφ+Rm2(r) sin mφ δ(r−r 0 ) = 1 r 0 δ(r − r 0 ) ×  1 2π + 1 π X ∞ m=1 cos mφ cos mφ0+sin mφ sin mφ0  C. S. Wu 1›8ù Green¼ê()