efault.m">p26_default.m</a>, 
          sets default values for problem 26.
        </li>
        <li>
          <a href = "p26_exact.m">p26_exact.m</a>, 
          sets the exact integral for problem 26.
        </li>
        <li>
          <a href = "p26_f.m">p26_f.m</a>, 
          evaluates the integrand for problem 26.
        </li>
        <li>
          <a href = "p26_i4.m">p26_i4.m</a>, 
          sets or gets I4 parameters for problem 26.
        </li>
        <li>
          <a href = "p26_lim.m">p