Example Heat Equation System Differing Diffusion Constants.ipynb is Broken

[rcalxrc08]

Hi all,

I was trying to find out how the PDE solver of DifferentialEquations.jl works, but i am experiencing some problem.
I took the example from the notebook and i tried to run it as a script (https://pastebin.com/hbgkNAxe) but i am getting the following error:
ERROR: LoadError: UndefVarError: parabolic_squaremesh not defined

Probably the notebook has not been updated for the new versions of DifferentialEquations.jl.

[ChrisRackauckas]

That tutorial should be removed. We deprecated our FEM toolbox in the DifferentialEquations.jl v4.0 upgrade and instead are re-doing our "easy PDE" support. You can get this to work by pinning DiffEqPDEBase.jl back to v0.3.5.

[ChrisRackauckas]

This has been deleted.