Fusion of Jones-Wenzl colors
= Fusion of Jones-Wenzl colors
In the reduced theory the product of colors a and b decomposes with multiplicity one into colors c satisfying $|a-b|\leq c\leq\min(a+b,2r-4-a-b)$ and $a+b+c$ even. These rules follow by iterating $1\otimes j=(j-1)\oplus(j+1)$, with color $r-1$ set to zero. The closure traces give $d_ad_b=\sum_cN_{ab}^cd_c$, and self-duality makes the multiplicities symmetric in all three colors.