Equation Icon  (5) E F G H REF GH gA gB gC n = 2∇ [AKB ]C, (56 ) (5)REF GH gAEnF gBGnH = − £nKAB + KAC KC B, (57 ) (5) C D C RCDgA gB = RAB − £nKAB − KKAB + 2KAC K B. (58 )