nger when using the various root-finding algorithms directly rather
            than the hand coded/optimized <code class="computeroutput"><span class="identifier">cbrt</span></code>
            routine.
          </li>
<li class="listitem">
            The importance of getting a good guess can be seen by the iteration count
            for the multiprecision case: here we "cheat" a little and use
            the cube-root calculated to double precision as the initial guess. The
            limitation of t