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## Main Question or Discussion Point

3j, 6j, 9j -symbols, Wigner-Eckart theorem, reducible matrix element, irreducible (spherical) tensor. I just cannot understand the notation. I just cannot fully understand the physics behind those concepts. Where can I find fully worked out example calculations?

Especially, the notation is difficult for me. Please, give some help. I am a Bachelor of Science in Physics. :uhh:

Especially, the notation is difficult for me. Please, give some help. I am a Bachelor of Science in Physics. :uhh: