Kriengsak Wattanawitoon
Usa Wannasingha Humphries
Poom Kumam

Strong convergence by new hybrid methods of modified Ishikawa iterations for two asymptotically nonexpansive mappings and semigroups

The paper is published: Rostocker Mathematisches Kolloquium, Rostock. Math. Kolloq. 63, 79 - 91 (2008)

MSC: 46C05 Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product)
  47D03 Groups and semigroups of linear operators {For nonlinear operators, see 47H20; see also 20M20}
  47H09 Nonexpansive mappings, and their generalizations
(ultimately compact mappings, measures of noncompactness and condensing mappings, $A$-proper mappings, $K$-set contractions, etc.)
  47H10 Fixed-point theorems [See also 54H25, 55M20, 58C30]
  47H20 Semigroups of nonlinear operators
ZDM: -  
CR: -  
PACS: -  

Abstract:   In this paper, we introduce the iterative sequence for two asymptotically nonexpansive mappings and two asymptotically nonexpansive semigroups. Then we prove strong convergence theorems for a common fixed point of two asymptotically nonexpansive mappings and for a common fixed point of two asymptotically nonexpansive semigroups by using the new hybrid methods in a Hilbert space. Moreover, we discuss the problem of strong convergence and we also apply our results to generalizes extend and improve these announced by Plubtieng and Ungchittrakool's result [Strong convergence of modified Ishikawa iterations for two asymptotically nonexpansive mappings and semigroups, Nonlinear Anal. 67 (2007) 2306--2315.] and Takahashi et al. [Strong convergence theorems by hybrid methods for families of nonexpansive mappings in Hilbert spaces, J.\ Math.\ Anal.\ Appl.\ 341 (2008) 276--286.].

Keywords:   strong convergence; nonexpansive mapping; Ishikawa iterations; asymptotically nonexpansive mappings; asymptotically nonexpansive semigroup


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