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Question: Need help to find analytical solution of a PDE?

Question:Need help to find analytical solution of a PDE?

JohnJames 0 Maple 13
error pde pdsolve
August 08 2012
0

Hi,

I am a beginner and am trying to solve the following PDE but get an error. 

PDE:=-diff(f(x1,x2),x1,x1)-diff(f(x1,x2),x2,x2) = a^2*f(x1,x2);

IBC := {D[1](f)(0,x2) = 0, D[1](f)(L1,0) = 0, D[1](f)(x1,0) = 0, D[1](f)(x1,L2) = 0};

ans := pdsolve(IBC,PDE);

"Error, (in pdsolve/BC) unable to handle derivatives in BCs involving arbitrary
 functions _Fn(...)"

Please guide me.

Thanks
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