Hostname: page-component-8448b6f56d-qsmjn Total loading time: 0 Render date: 2024-04-15T13:34:53.108Z Has data issue: false hasContentIssue false

Strong Convergence of Approximating Fixed Point Sequences for Nonexpansive Mappings

Published online by Cambridge University Press:  17 April 2009

Hong-Kun Xu
Affiliation:
School of Mathematical SciencesUniversity of KwaZulu-NatalWestville CampusPrivate Bag X54001Durban 4000South Africa e-mail: xuhk@ukzn.ac.za
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Consider a nonexpansive self-mapping T of a bounded closed convex subset of a Banach space. Banach's contraction principle guarantees the existence of approximating fixed point sequences for T. However such sequences may not be strongly convergent, in general, even in a Hilbert space. It is shown in this paper that in a real smooth and uniformly convex Banach space, appropriately constructed approximating fixed point sequences can be strongly convergent.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 2006

References

[1]Alber, Y.I. and Guerre-Delabriere, S., ‘On the projection methods for fixed point problems’, Analysis (Munich) 21 (2001), 1739.Google Scholar
[2]Bruck, R.E., ‘On the convex approximation property and the asymptotic behaviour of nonlinear contractions in Banach spaces’, Israel J. Math. 38 (1981), 304314.CrossRefGoogle Scholar
[3]Genel, A. and Lindenstrass, J., ‘An example concerning fixed points’, Israel J. Math. 22 (1975), 8186.CrossRefGoogle Scholar
[4]Goebel, K. and Kirk, W.A., Topics in metric fixed point theory, Cambridge Studies in Advanced Mathematics 28 (Cambridge University Press, Cambridge, 1990).CrossRefGoogle Scholar
[5]Kamimura, S. and Takahashi, W., ‘Strong convergence of a proximal-type algorithm in a Banach space’, SIAM J. Optim. 13 (2003), 938945.CrossRefGoogle Scholar
[6]Kim, T.H. and Xu, H.K., ‘Strong convergence of modified Mann iterations’, Nonlinear Anal. 61 (2005), 5160.CrossRefGoogle Scholar
[7]Kim, T.H. and Xu, H.K., ‘Strong convergence of modified Mann iterations for asymptotically nonexpansive mappings and semigroups’, Nonlinear Anal. 64 (2006), 11401152.CrossRefGoogle Scholar
[8]Mann, W.R., ‘Mean value methods in iteration’, Proc. Amer. Math. Soc. 4 (1953), 506510.CrossRefGoogle Scholar
[9]Marino, G. and Xu, H.K., ‘Convergence of generalized proximal point algorithms’, Commun. Pure App. Anal. 3 (2004), 791808.CrossRefGoogle Scholar
[10]Matinez-Yanes, C. and Xu, H.K., ‘Strong convergence of the CQ method for fixed point processes’, Nonlinear Anal. 64 (2006), 24002411.CrossRefGoogle Scholar
[11]Nakajo, K. and Takahashi, W., ‘Strong convergence theorems for nonexpansive mappings and nonexpansive semigroups’, J. Math. Anal. Appl. 279 (2003), 372379.CrossRefGoogle Scholar
[12]Reich, S., ‘Weak convergence theorems for nonexpansive mappings in Banach spaces’, J. Math. Anal. Appl. 67 (1979), 274276.CrossRefGoogle Scholar
[13]Shioji, N. and Takahashi, W., ‘Strong convergence of approximated sequences for nonexpansive mappings in Banach spaces’, Proc. Amer. Math. Soc. 125 (1997), 36413645.CrossRefGoogle Scholar
[14]Solodov, M.V. and Svaiter, B.F., ‘Forcing strong convergence of proximal point iterations in a Hilbert space’, Math. Program. Ser. A 87 (2000), 189202.CrossRefGoogle Scholar
[15]Wittmann, R., ‘Approximation of fixed points of nonexpansive mappings’, Arch. Math. (Basel) 58 (1992), 486491.CrossRefGoogle Scholar
[16]X, H.K., ‘Inequalities in Banach spaces with applications’, Nonlinear Anal. 16 (1991), 11271138.Google Scholar
[17]Xu, H.K., ‘Iterative algorithms for nonlinear operators’, J. London Math. Soc. (2) 66 (2002), 240256.CrossRefGoogle Scholar