an urgent question for matlab

Hi,

I am trying to solve the following partial differential equation with 4 boundary conditions with mathematica. But it doesn't work.

sigma is a constant in here.
****************************
t[y, z] - Gamma^2*t_xx[y, z] + t_yy[y, z]= Sigma

The boundary conditions are:
t(y,0)=\sigma
t(y,L)=\sigma
t(-h/2,Z)=0
t(h/2,Z)=0

Does anyone know how to solve the problem?

Thanks for advance
.

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