tailieunhanh - Báo cáo toán học: " Convergence of the modified Mann’s iterative method for asymptotically -strictly pseudocontractive mappings"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Convergence of the modified Mann’s iterative method for asymptotically -strictly pseudocontractive mappings | Zhang and Xie Fixed Point Theory and Applications 2011 2011 100 http content 2011 1 100 Fixed Point Theory and Applications a SpringerOpen Journal RESEARCH Open Access Convergence of the modified Mann s iterative method for asymptotically -strictly pseudocontractive mappings Ying Zhang1 2 and Zhiwei Xie3 Correspondence spzhangying@ 1School of Mathematics and Physics North China Electric Power University Baoding Hebei 071003 . China Full list of author information is available at the end of the article Springer Abstract Let E be a real uniformly convex Banach space which has the Fréchet differentiable norm and K a nonempty closed and convex subset of E. Let T K K be an asymptotically K-strictly pseudocontractive mapping with a nonempty fixed point set. We prove that I - T is demiclosed at 0 and obtain a weak convergence theorem of the modified Mann s algorithm for T under suitable control conditions. Moreover we also elicit a necessary and sufficient condition that guarantees strong convergence of the modified Mann s iterative sequence to a fixed point of T in a real Banach spaces with the Fréchet differentiable norm. 2000 AMS Subject Classification 47H09 47H10. Keywords asymptotically K-strictly pseudocontractive mappings demiclosedness principle the modified Mann s algorithm fixed points 1 Introduction Let E and E be a real Banach space and the dual space of E respectively. Let K be a nonempty subset of E. Let J denote the normalized duality mapping from E into 2E given by J x f e E x f x 2 f 2 for all x e E where denotes the duality pairing between E and E . In the sequel we will denote the set of fixed points of a mapping T K K by F T x e K Tx x . A mapping T K K is called asymptotically K-strictly pseudocontractive with sequence Kn n 1 c 1 to such that limn K 1 see . 1-3 if for all x y e K there exist a constant K e 0 1 and j x - y e J x - y such that Tx - Ty j x - y Kn II x - yll2 - K II x - y - Tnx - Tny 2

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