k" href="../roots_deriv.html#math_toolkit.roots_deriv.newton">Newton-Raphson
            iteration</a> was found to be twice as quick as either of the second-derivative
            methods: this is an extreme case though, the function and its derivatives
            are so cheap to compute that we're really measuring the complexity of
            the boilerplate root-finding code.
          </li>
<li class="listitem">
            For multiprecision types only one or two extra <span class="emphasis"><em>iter