Equation Icon  ( ) ∫ τ− (m + δm )aμ = e2(δμ + uμuν) 2-˙aν + 1R ν uλ + 2e2u ν ∇ [μG ν]′(z(τ),z(τ′))uλ′dτ′(18.46 ) ν 3 3 λ − ∞ +λ