Matthew Knepley <[email protected]> writes: > Fieldsplit block preconditioners can be used on this type of matrix, but > success obviously depends on the > analytic character of the operators. In particular, if we assume that we > have great PCs for the diagonal, > then B is the most important variable, and we need to know what the Schur > complement > > B^T A^{-1} B or equiv B^T C^{-1} B
Matt means
D - B^T A^{-1} B
or
A - B C^{-1} B^T
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