=131766.131776" target="_top">Didonato
          and Morris</a>, and is used in this implementation when a and b are
          both greater than 1:
        </p>
<p>
          <span class="inlinemediaobject"><img src="../../../../equations/ibeta6.png"></span>
        </p>
<p>
          For smallish b and x then a series representation can be used:
        </p>
<p>
          <span class="inlinemediaobject"><img src="../../../../equations/ibeta7.png"></span>
        </p>
<p>
          When b &lt;&lt; a then th