Equation Icon  ( ) --------- u a, b ab- u (b,a)ab = - i \~/ [aXb], (13) ( ) --------- 1 cd ( C' C) u a, b ab + u (b,a)ab = 2 \~/ cXde ab + i eA'B'a(A\ ~/ B)C'b - eABb(A'\ ~/ B')Ca , (14)