…
►In a symbol, if the three angular momenta do not satisfy the triangle conditions (34.2.1), or if the projectivequantumnumbers do not satisfy (34.2.3), then the symbol is zero.
…However, the and symbols may vanish for certain combinations of the angular momenta and projectivequantumnumbers even when the triangle conditions are fulfilled.
…
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ⓘ
Notes:
Material from the Special Year on Quantum Field Theory held at
the Institute for Advanced Study, Princeton, NJ, 1996–1997