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On the second finest level (with 17 
17 grid points)
the coarse grid correction to the finest level solution (with 33 33
grid points) is computed.
To obtain this, the
result of level 17 17 presmoothing
and the interpolated
level 9 9 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 the of the result of the V Cycle.
Ulrich Ruede , Thu Feb 2 21:04:51 MEZ 1995
Updated by Craig C. Douglas