=+11.5. !

(a) Assume fef and let fn = (n(f - f A 1) A 1. Show that f(w) ≤ 1 implies f_(w) =0 for all n and f(w) > 1 implies f.(w) =1 for all sufficiently large n. Conclude that for x > 0,

(11.7)

(0, xf„] 1 [w:f(@)>1] x(0,x].