<div dir="ltr">Hello
<div><br></div><div>I just want to make sure that I understand the right thing, in the manual page of PCFieldSplitSetSchurFactType: <a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCFieldSplitSetSchurFactType.html">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCFieldSplitSetSchurFactType.html</a></div><div><br></div><div>The "upper" option uses DU from the full factorization. If I understand correctly, the ksp must be used with right preconditioning, because A P^-1 = (LDU) * (DU)^(-1) = L. If that was the case, should the manual put this information to be more clear?</div><div><br></div><div>Thanks</div><div>Giang</div><div><br></div></div>