Equation Icon  I I δX d = i¯𝜖Γ Ψd I μ I 1- I J K abc IJK 1- J J I abc I ,δΨd = D μX dΓ Γ 𝜖 − 6 X aX b X c f dΓ 𝜖 + 2X aX b X cg dΓ 𝜖 &tidle; c I abc ,δA μ d = i¯𝜖Γ μΓ IX aΨbh d . (502 )