[petsc-users] Nullspaces for schur complement PCs

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:
>   Indeed it could. Perhaps we could start by unifying the concept of a
>   sub matrix and a Schur complement of the same part of the matrix?
>   I'm not sure how to do that.

We can certainly define an interface that works this way, but I'm not
sure it's practical.
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