Equation Icon  ( ) ′ ′ γRα′β′;γ′(x ′) = − 4m u (α′R β′)δ′γ′𝜖′ + R α′δ′β′𝜖′uγ′ uδ u𝜖 + γtαa′ilβ′γ′, (19.78 )