Matthew Knepley <[email protected]> writes: >>At the same time, the first block, as discussed, has >> these zeros on the diagonal, and can’t use SOR. >> > > Chebyshev/Jacobi is the obvious next try.
Not really; the Chebyshev polynomial exceeds 1 left of the origin, so it's pretty non-functional on indefinite operators. Pretending like Gideon's saddle point problem is positive definite is not a solution.
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