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<B>THREEJSYMBOL</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>ThreejSymbol</em> operator implements the 3j symbol. 
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syntax: </H3>
<em>ThreejSymbol</em>(&lt;list of j1,m1&gt;,&lt;list of j2,m2&gt;, 
&lt;list of j3,m3&gt;) 
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examples: </H3>
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ThreejSymbol({j+1,m},{j+1,-m},{1,0}); 


        j
  ( - 1)  *(abs(j - m + 1) - abs(j + m + 1))
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             3       2                    m
   2*sqrt(2*j   + 9*j   + 13*j + 6)*( - 1)

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