Equation Icon  -1 -1- ℛ γ,μ (x ) ≡ ∂μχγ(x) + 2! χ◟ζ(x)∂◝μ◜χ-ζ′(x)◞+ ⋅⋅⋅ + k ! χη(x)χη′(x)⋅⋅⋅χ η′′(x )∂μ&# ζ+ ζ′=γ γ η+η′+⋅⋅⋅+ η′′+ η′′′=γ