 the root.<br>
              It is a precondition that <span class="emphasis"><em>min &lt; max</em></span> and <span class="emphasis"><em>f(min)*f(max)
              &lt;= 0</em></span>, the function raises an <a class="link" href="../error_handling.html#math_toolkit.error_handling.evaluation_error">evaluation_error</a>
              if these preconditions are violated. The action taken on error is controlled
              by the <a class="link" href="../../policy.html" title="Chapter&#160;18.&#160;Policies