/li>
        <li>
          <a href = "p03_m.m">p03_m.m</a>, 
          returns the spatial dimension for problem 3.
        </li>
        <li>
          <a href = "p03_sol.m">p03_sol.m</a>, 
          returns known solutions for problem 3.
        </li>
        <li>
          <a href = "p03_title.m">p03_title.m</a>, 
          returns a title for problem 3.
        </li>
        <li>
          <a href = "p04_ab.m">p04_ab.m</a>, 
          returns bounds for problem 4.
        </li>
        <li>
          <