> Hi, > > I have two questions: > 1. Are the multilevel FEM method and the adaptive refinement > compatible (step-6 + step-16)? > 2. What needs to be done to adapt tutorial step-16 for Neumann > boundary conditions? Step-11 suggests using > DoFTools::extract_boundary_dofs() to set the average boundary value > to 0, but there is no extract_boundary_dofs() for MGTools class. > Also, is the average value zeroing necessary in the > assemble_multigrid() function? > > Thank you, > Yury
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