Equation Icon   sum ( prod V~ ------- prod ZD[{ji}] = lim (-1)2ji 2ji + 1 /\(L) -1 L-->o o xe<L ext.edges:i in{t.vertices }) prod prod sum 6 j(t) j1(t) j2(t) j3(t) × (2xl + 1) (- 1) i=1 i j (t) j (t) j (t) , (67) int.edges:l tetra:t 4 5 6