       f(x) = exp ( sum ( c(1:m) * x(1:m) ) );
        </li>
        <li>
          f(x) = sum ( abs ( x(1:m) - 0.5 ) );
        </li>
        <li>
          f(x) = exp ( sum ( abs ( 2 * x(1:m) - 1 ) ) );
        </li>
        <li>
          f(x) = product ( 1 <= i <= m ) ( i * cos ( i * x(i) ) );
        </li>
        <li>
          f(x) = product ( 1 <= i <= m ) t(n(i))(x(i)), t(n(i)) 
          is a Chebyshev polynomial;
        </li>
        <li>
          f(x) = sum ( 1 <= i <= m ) (-1)^i * product ( 1