[petsc-users] Scalable Direct Coarse Solver for PCMG

[Jed Brown]

On Tue, Jan 17, 2012 at 06:16, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Not unless you formulate A^T A which doubles the condition number.


Jack pointed out my typo, of course this *squares* the condition number
(not a good idea unless your coarse level is quite well-conditioned).
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