[petsc-users] having issues with nullspace

[Jed Brown]

Mohammad Mirzadeh <mirzadeh at gmail.com> writes:

> Jed,
>
> No the matrix is actually non-symmetric due to grid adaptivity (hanging
> nodes of QuadTree). Anyway, what do you exactly mean by the system being
> inconsistent?

Sounds like the right and left null spaces are different.  You can test
by checking the null space using the transpose of your system.
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