Equation Icon  ∫ u ∫ τ< γ αβ(x) = 4m-U αβ′ ′(x,x ′)uγ′uδ′ + 4m V αβ (x,z)u μuν dτ + 4m G αβ (x,z)u μuν dτ, (498 ) r γ δ τ< μν −∞ + μν