Question: Asking for help

I have been trying to solve the following diffusion equations

  diff(u(z, t), t) = D*diff(u(z, t), z, z) + A*z*exp(lambda*z)

my boundary canditions are


I have followed the examples on tte link below, but I am unable to get the solution when I write the boundary conditions. It there anything I am doing wrongly? I would be most grateful if an email can be sent to me with with the solution that I can download fram an attachment



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