[其他] [PDE]

[AAJJBurnett (叫我投手)]

 Solve
       2
  1   δu     δu
 --- -------= ---  ,x>0 ,t>0
  2   δx^2   δt


   δu |
  ---- |    = 0 , t>0
   δx |x=0


         -2x
 u(x,0)=e    , x>0

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