Hi, I am interesting in solving elliptic problems where there is a Dirichlet condition on internal nodes. It seems like this isn't possible with the default DirichletBC class in firedrake - is that right and is there a nice work around? My example is to do with remeshing and moving meshes. Consider the situation from https://www.firedrakeproject.org/demos/immersed_fem.py.html and suppose the want to recompute the mesh coordinates by solving -Delta x = 0 in Omega_{1,2} x = x_g on the interface and outside boundary where x_g is the parametrisation on the interface which we want to be exactly given. We have access to all the tags but this information doesn't change the solution. A couple of alternatives: - use a Nitsche-type approach - this does ok but I would prefer to not have this extra parameter unnecessarily. - we can find the nodes which we are on the interface but I don't know how to change the matrices/vectors to use this info. Can you help? Thanks, Tom