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<a name="Exponential-Integrals"></a>
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<p>
Next: <a href="Fermi_002dDirac-Function.html#Fermi_002dDirac-Function" accesskey="n" rel="next">Fermi-Dirac Function</a>, Previous: <a href="Exponential-Functions.html#Exponential-Functions" accesskey="p" rel="previous">Exponential Functions</a>, Up: <a href="Special-Functions.html#Special-Functions" accesskey="u" rel="up">Special Functions</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Exponential-Integrals-1"></a>
<h3 class="section">7.17 Exponential Integrals</h3>
<a name="index-exponential-integrals"></a>
<a name="index-integrals_002c-exponential"></a>

<p>Information on the exponential integrals can be found in Abramowitz &amp;
Stegun, Chapter 5.  These functions are declared in the header file
<samp>gsl_sf_expint.h</samp>.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Exponential-Integral.html#Exponential-Integral" accesskey="1">Exponential Integral</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Ei_0028x_0029.html#Ei_0028x_0029" accesskey="2">Ei(x)</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Hyperbolic-Integrals.html#Hyperbolic-Integrals" accesskey="3">Hyperbolic Integrals</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Ei_005f3_0028x_0029.html#Ei_005f3_0028x_0029" accesskey="4">Ei_3(x)</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Trigonometric-Integrals.html#Trigonometric-Integrals" accesskey="5">Trigonometric Integrals</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Arctangent-Integral.html#Arctangent-Integral" accesskey="6">Arctangent Integral</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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