Hi everyone,(adsbygoogle = window.adsbygoogle || []).push({});

I'm reading about the Wigner-Eckhart Theorem and the coupling of spherical tensor operators in Sakurai's Advanced Quantum Mechanics.

I then came across this file, which states these concepts in Theorem 1 and 3.

I'm now trying to find a connection between this coupling of tensor operators and 6j and 9j symbols. In the above document, such a link is established in the very last line, but I don't quite understand it. Nothing like this is mentioned in Sakurai and I can't find any other source that provides how these things are connected.

Is there a good source discussing this?

Thanks in advance for any help

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# Tensor coupling and 6j/9j symbols

**Physics Forums | Science Articles, Homework Help, Discussion**