[dune-pdelab] Deflated CG

[Anne Reinarz]

Hi everyone,

I have a linear system I'm trying to solve with CG preconditioned with AMG, but the operator has a kernel of dimension 6, so the norm of the residual is very high and the stopping criterion doesn't seem to work. I was wondering if other people have had similar problems. Is there is a deflated preconditioned CG available, or something similar?

Thanks for your help,
Anne
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