주기사항
영문초록 : Let (E, Ⅱ) be a real Banach space and let C be a closed convex subset of E. A mapping T: C→C is called nonexpansive on C, or T∈Cont(C) if |Tx - Ty|□|x - y| ∀x, y∈C The purpose of this study is to study the asymptotic behavior of iterates T^(n)x in Banach spaces. In charter 3, in a real Hilbert space H, we study that □ tends to a limit y as n→∞ , and that R(I-T)^- has the minimum property. In chapter 4, we deal with the weak convergence of the sequence T^(n)x and the Cesaro mean S_(n)x of the sequence T^(n)x as n→∞ in H. we also study the some results concerning the strong convergence of S_(n)x in H. Finally, in chapter 5, we investigate in a smooth and uniformly convex Banach space E, the conditions that are equivalent to the existance of w-lim _(n→∞) T^(n)x.