1. Introduction
Let C be a nonempty subset of a normed space X and let T: C ! C be a self-map¬ping. We denote as Fix(T) the set of all fixed points of T, that is Fix(T) = {x 2 C : Tx = x}. Recall that the mapping T is said to be
(i) nonexpansive if, \Tx — Ty\ 6 ||x — y|| for all x,y 2 C;
(ii) asymptotically nonexpansive (Goebel and Kirk, 1972) if, there exists a sequence {yn} in [1, +i) with limn!1yn = 1 such that ||Tnx — Tny|| 6 T«l|x — y||, for all x,y 2 C and n 2 N;
(iii) uniformly Lipschitzian if there exists a constant L > 0 such that ||Tnx — Tny\ 6 L\x — y||, for all x,y 2 C and n 2 N. Evidently, every nonex- pansive mapping is asymptotically nonexpansive and every asymptotically nonexpansive mapping is uniformly Lipschitzian.