[petsc-users] How does KSPSetNullSpace() work?

[Mohamad M. Nasr-Azadani]

Hi guys,

It might be a naive question, but I am wondering how KSPSetNullSpace()
works when it is passed to a linear system ksp context?
Say, for instance, we have the simple case of Poisson equation solved in a
square domain and Neumann boundary condition applied to all boundaries.
Does it take the integral of the solution and set it to zero as an extra
constraint?

Thanks,
Mohamad
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