e can substitute them into (4.84) to obtain (AAA = E(Ap)s Trs = 8 E d(Ap)s 74(9 + O(81 (4.90) d6 = E (E sit I ) +O(62) (4.91) s s .5=o (Esirs) ° Cal (4.92) The last line is just notation. The angular brackets denote the average and the 0 subscript refers to the neutral state S = 0. Note