=+

(b) Assume that f = 1, set u = En-Inf ,, and assume that

(8.54)

ged[ n: n ≥1, f ,, > 0] = 1.

Prove the renewal theorem; Under these assumptions, the limit u = lim ,, u, exists, and u > 0 if and only if p < œo, in which case u = 1/u.