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On the intermediate level (with 9 9 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 presmoother on the next finer level (and becomes a correction for the still finer grid problems).
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Ulrich Ruede , Thu Feb 2 21:04:47 MEZ 1995
Updated by Craig C. Douglas