also <a href="https://www.mcs.anl.gov/petsc/petsc-current/src/snes/tutorials/index.html">src/snes/tutorials</a> </li>
    </ul>
  </li>
  <li> <a href="#example4">Linear Stokes-type PDE on a structured grid</a> </li>
  <li> <a href="#example5">Nonlinear time dependent PDE on Unstructured Grid</a> </li>
</ul>

<p>
  Several examples are also included that represent the interoperability with
  other numerical software packages in the
  <a href="http://www.xsdk.info">xSDK Toolkit</a>. These packages can be
  a