Barry Smith <bsm...@mcs.anl.gov> writes: >> If you mean literally 3 scalar laplacians packed in one matrix for >> some reason then the one constant vector is fine. > > Really, but (for periodic or N. bc) the null space has three > vectors, you don't need all of them in your near null space?
If the three scalar Laplacians are truly decoupled, then they will be disjoint on coarse levels of GAMG. (GAMG won't know that they happen to share a mesh.)
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