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Postsmoother on second coarsest level

On the second coarsest level (with 5 5 grid points) the result of presmoothing and the interpolated coarse grid correction are combined. The result is

Then a single sweep of the Gauß-Seidel method is applied to smooth the result.

This solution is interpolated and combined with the result of the smoother on the next finer level and becomes a correction for the still finer grid problems.

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Ulrich Ruede , Thu Feb 2 21:04:43 MEZ 1995
Updated by Craig C. Douglas