  returns known solutions for problem 6.
        </li>
        <li>
          <a href = "p06_title.m">p06_title.m</a>, 
          returns a title for problem 6.
        </li>
        <li>
          <a href = "p07_ab.m">p07_ab.m</a>, 
          returns bounds for problem 7.
        </li>
        <li>
          <a href = "p07_f.m">p07_f.m</a>, 
          returns the objective function value for problem 7.
        </li>
        <li>
          <a href = "p07_m.m">p07_m.m</a>, 
          returns the spatial dime