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<h4 class="subsection">7.8.3 9-j Symbols</h4>
<div class="defun">
— Function: double <b>gsl_sf_coupling_9j</b> (<var>int two_ja, int two_jb, int two_jc, int two_jd, int two_je, int two_jf, int two_jg, int two_jh, int two_ji</var>)<var><a name="index-gsl_005fsf_005fcoupling_005f9j-435"></a></var><br>
— Function: int <b>gsl_sf_coupling_9j_e</b> (<var>int two_ja, int two_jb, int two_jc, int two_jd, int two_je, int two_jf, int two_jg, int two_jh, int two_ji, gsl_sf_result * result</var>)<var><a name="index-gsl_005fsf_005fcoupling_005f9j_005fe-436"></a></var><br>
<blockquote><p>These routines compute the Wigner 9-j coefficient,
<pre class="example"> {ja jb jc
jd je jf
jg jh ji}
</pre>
<p class="noindent">where the arguments are given in half-integer units, ja =
<var>two_ja</var>/2, ma = <var>two_ma</var>/2, etc.
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