[petsc-users] Algorithms to remove null spaces in a singular system

[Kong, Fande]

Hi All,

I know how to remove the null spaces from a singular system using creating
a MatNullSpace and attaching it to Mat.

I was really wondering what is the philosophy behind this? The exact
algorithms we are using in PETSc right now?  Where we are dealing with
this, preconditioner, linear solver, or nonlinear solver?


Fande Kong,
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