| PC_MG_FULL | - same as multiplicative except one also performs grid sequencing,
that is starts on the coarsest grid, performs a cycle, interpolates
to the next, performs a cycle etc. This is much like the F-cycle presented in "Multigrid" by Trottenberg, Oosterlee, Schuller page 49, but that
algorithm supports smoothing on before the restriction on each level in the initial restriction to the coarsest stage. In addition that algorithm
calls the V-cycle only on the coarser level and has a post-smoother instead.
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