"Garth N. Wells" <[email protected]> writes: >> CG is usually robust to this form of weak asymmetry. > > Even with preconditioning, say ILU?
Most of the time, yes. Just try it. $ ~/petsc/src/snes/examples/tutorials/ex5 -da_refine 3 -ksp_type cg -pc_type ilu -ksp_monitor_true_residual But it's not something to rely on, so use it carefully.
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