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Local and non-local boundary conditions
Boundary conditions can be local, meaning that the boundary point can be updated based on data in its immediate vicinity, or non-local, meaning that the new value on the boundary depends on data from a remote region of the computational domain (for a parallel simulation this data could for example be physically located on several different processors). An example of the latter is a ``rotating'' symmetry condition, which arises e.g. when one uses a quadrant to simulate a physical domain which possesses a rotational symmetry.