equation icon  n n lim n fn+1pn+n+1(x)-= - lim nfn--1pn+n--1(x) = iek [1 - 2x + ((1 - 2x)2 - 1)1/2]. (135) n-->o o fnnpn+n(x) n-->- oo fnnpn+n(x) 2