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How to put higher order boundary conditions while solving 4th order time dependent pde (1d)

1

Dear all, I am trying to solve Cahn hilliard eqn (a 4th order time dependent pde) but im not able to figure out syntax to put 2nd and 3rd order...

How to ignore reference solution

2

i am replicating for euler beam code given in deepxde library. It is mentioned that if i don't have reference solution then i can ignore it, but I'm not able...