Equation Icon  ℰ ∗ := ℰ∗Ωa = ℰ Ωa Ωb, (10.77 ) ∗ A a∗ Aa b ab A a b ∗ ℰAB := ℰabΩ AΩ B = 2ℰabΩ AΩ B + ℰ ΩAB, (10.78 ) ℬ ∗ := ℬ∗Ωa = 𝜀abcΩa Ωb ℬc Ωd, (10.79 ) ∗ A a∗ Aa b A cdd a b ℬAB := ℬabΩA ΩB = 2𝜀acdΩ ℬ bΩ(AΩ B). (10.80 )