r problem 2.
        </li>
        <li>
          <a href = "p02_sol.m">p02_sol.m</a>, 
          returns known solutions for problem 2.
        </li>
        <li>
          <a href = "p02_title.m">p02_title.m</a>, 
          returns a title for problem 2.
        </li>
        <li>
          <a href = "p03_ab.m">p03_ab.m</a>, 
          returns bounds for problem 3.
        </li>
        <li>
          <a href = "p03_f.m">p03_f.m</a>, 
          returns the objective function value for problem 3.
        <