https://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/tutorials/output/ex42_tut_1.out">[Expected output]</a>
    </pre>
    Note the poor convergence for even a very small problem
  </li>
  <li> Solve with a solver appropriate for Stoke's problems -stokes_pc_type fieldsplit -stokes_pc_fieldsplit_type schur
    <pre>
     mpiexec -n 4 ./ex42  -stokes_ksp_monitor -stokes_pc_type fieldsplit -stokes_pc_fieldsplit_type schur  <a href="https://www.mcs.anl.gov/petsc/petsc-current/src/ksp/ksp/tutorials/output/ex4