Barry Smith <[email protected]> writes: > Perhaps we need a generic way of attaching null spaces to parts of > matrices and to parts of matrices in different basis (which is what > a Schur complement is). So (and this is likely overly simplistic) > one could supply a null space, an index set, and a flag indicating > either "part of the matrix" or the "Schur complement of the matrix > with respect to an index set". These provided null spaces could > then be used by the preconditioners (like Fieldsplit) that > manipulate parts of the matrix or Schur complement.
Yes, this is conceptually right, but it looks to me like it gets hairy for recursive splitting.
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