emediaobject"><img src="../../../equations/atanh1.svg"></span>
      </p>
<p>
        along with a selection of sanity check values computed using functions.wolfram.com
        to at least 50 decimal digits.
      </p>
<h5>
<a name="math_toolkit.inv_hyper.atanh.h2"></a>
        <span class="phrase"><a name="math_toolkit.inv_hyper.atanh.implementation"></a></span><a class="link" href="atanh.html#math_toolkit.inv_hyper.atanh.implementation">Implementation</a>
      </h5>
<p>
        For sufficiently small x w