Equation Icon  (2,0,ln) (2,0,ln) (2,0,ln) a (2,0,ln) (2,0,ln) a b hBαβ = Aˆ tαtβ + 2 ˆC a t(βx α) + (δab ˆK + ˆH ab )xαx β. (22.63 )