The details are expounded of an old treatment of the limit of the su(N) structure constants as N tends to infinity. A recently derived parity property of the series expansion is shown to be the same as the known mirror symmetry of 6-j symbols.
Structure Constants in $\mathcal{N} = 4$ SYM and Separation of Variables
Divergence of the $1/N_f$ series expansion in QED
An alternative to diagrams for the critical O(N) model: dimensions and structure constants to order $1/N^2$
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