[petsc-dev] Problem with SNES and FieldSplit

[Jed Brown]

On Wed, Mar 16, 2011 at 00:16, Matthew Knepley <knepley at gmail.com> wrote:

> without the MatNest (I do not see what it adds here).


It makes it easy to drop special things into other slots, implements
MatMult, MatView, etc.
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