In my problem, on all the boundaries, I have Neumann BC: u_n=0
But, NonlinearPDE always ask for the "bc" argument.
Is it correct, if I define a Dirichlet BC but for nowhere, and pass it to
NonlinearPDE? (for example, using this condtion for defining the subdomain of
Dirichlet BC: abs(x[0] - 500.0) < DOLFIN_EPS && on_boundary)
Reza
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