ksp/tutorials/index.html">src/ksp/ksp/tutorials</a> </li>
    </ul>
  </li>

  <li> <a href="#example2">Nonlinear ODE arising from a time-dependent one dimensional PDE</a>
    <ul>
      <li> example of time-stepping problem </li>
      <li> see also <a href="https://www.mcs.anl.gov/petsc/petsc-current/src/ts/tutorials/index.html">src/ts/tutorials</a></li>
    </ul>
  </li>
  
  <li> <a href="#example3">Nonlinear PDE on a structured grid</a>
    <ul>
      <li> example of nonlinear PDE </li>
      <li> see 