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Next: <a href="Dawson-Function.html#Dawson-Function" accesskey="n" rel="next">Dawson Function</a>, Previous: <a href="Coulomb-Functions.html#Coulomb-Functions" accesskey="p" rel="previous">Coulomb 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="Coupling-Coefficients-1"></a>
<h3 class="section">7.8 Coupling Coefficients</h3>
<a name="index-coupling-coefficients"></a>
<a name="index-3_002dj-symbols"></a>
<a name="index-6_002dj-symbols"></a>
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<a name="index-Wigner-coefficients"></a>
<a name="index-Racah-coefficients"></a>

<p>The Wigner 3-j, 6-j and 9-j symbols give the coupling coefficients for
combined angular momentum vectors.  Since the arguments of the standard
coupling coefficient functions are integer or half-integer, the
arguments of the following functions are, by convention, integers equal
to twice the actual spin value.  For information on the 3-j coefficients
see Abramowitz &amp; Stegun, Section 27.9.  The functions described in this
section are declared in the header file <samp>gsl_sf_coupling.h</samp>.
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