Equation Icon  --1-- a1⋅⋅⋅a6 ℒ2 = 2 ⋅ 6! 𝒟 𝒜a1⋅⋅⋅a6(t)𝒟 𝒜 (t), 1 (9.132 ) ℒ3 = -----𝒟 𝒜a |b1⋅⋅⋅b8(t)𝒟 𝒜a |b1⋅⋅⋅b8(t). 2 ⋅ 9!