I couldn't solve a pde problem with boundary values in mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg86118] I couldn't solve a pde problem with boundary values in mathematica*From*: atepe <aysegul.tepe at yahoo.com>*Date*: Sun, 2 Mar 2008 13:56:57 -0500 (EST)

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. **************************** Simplify[DSolve[ t[y, z] - \[Gamma]^2*(D[t[y, z], {y, 2}] + D[t[y, z], {z, 2}]) == \[Sigma], t, {y, z}]] 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