    to ensure thread safety when using user-defined number types. See for
            example the use of <code class="computeroutput"><span class="identifier">erf_initializer</span></code>
            in <a href="../../../../include/boost/math/special_functions/erf.hpp" target="_top">erf.hpp</a>.
          </li>
</ul></div>
<p>
        Here are some other useful internal functions:
      </p>
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