Equation Icon  ⟨ ⟩ ( ) ( )( ) F ¯ = lim − 4e- u[¯αa¯ + 2eu [¯α g ¯ + u¯u ¯γ 2˙a¯γ + 1-R¯γ¯u¯δ + Fta¯il, (18.28 ) ¯αβ s→0 3s β] β]¯γ β] 3 3 δ ¯αβ