[petsc-users] Solving/creating SPD systems

[Justin Chang]

Hi all,

Say I have a saddle-point system for the mixed-poisson equation:

[I  -grad] [u]  = [0]
[-div  0  ] [p]     [-f]

The above is symmetric but indefinite. I have heard that one could make the
above symmetric and positive definite (SPD). How would I do that? And if
that's the case, would this allow me to use CG instead of GMRES?

Thanks,
Justin
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