Equation Icon  4m ′ ′ 4m ′ ′ 4m ′ ′ ′ γαβ;γ(x) = − --2 U αβα′β′uα uβ ∂γr +---U αβα′β′;γu αu β + ---U αβα′β′;γ′uα uβ uγ ∂γu r α ′β′ rtail r + 4mV αβα′β′u u ∂γu + γαβγ(x ), (19.33 )