General solution of the diffusion equation

The diffusion equation in a multiplying medium reads

Подпись:where

The solution of the diffusion equation is

Подпись:, , u(r) (A e—7r + B e7r) ,

‘(r) =——— =———————— where 7

image476 Подпись: (10.4)

rr

We now apply the method to media 2 and 3.