Abstract
In this paper, we introduce new iterative schemes for approximating common elements of the set of solutions of generalized equilibrium problems and the set of fixed points of nonexpansive multi-valued mappings. We prove some strong convergence theorems of the sequences generated by our iterative process under appropriate additional assumptions in Hilbert spaces. Moreover, we give some numerical results for supporting our main theorem. Our main results improve the corresponding ones obtained in (S. Takahashi, W. Takahashi: Nonlinear Anal. 69: 1025–1033, 2008).
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Anh, P.N., Muu, L.D., Nguyen, V.H., Strodiot, J.J.: Using the Banach contraction principle to implement the proximal point method for multivalued monotone variational inequalities. J. Optim. Theory Appl. 124, 285–306 (2005)
Aoyama, K., Kimura, Y., Takahashi, W.: Maximal monotone operators and maximal monotone functions for equilibrium problems. J. Convex Anal. 15, 395–409 (2008)
Aoyama, K., Kimura, Y., Takahashi, W., Toyoda, M.: Approximation of common fixed points of a countable family of nonexpansive mappings in a Banach space. Nonlinear Anal. TMA 67, 2350–2360 (2007)
Assad, N.A., Kirk, W.A.: Fixed point theorems for set-valued mappings of contractive type. Pac. J. Math. 43, 553–562 (1972)
Blum, E., Oettli, W.: From optimization and variational inequalities to equilibrium problems. Math. Stud. 63, 123 –145 (1994)
Ceng, L.-C., Ansari, Q.H., Yao, J.-C.: Mann-type steepest-descent and modified hybrid steepest-descent methods for variational inequalities in Banach spaces. Numer. Funct. Anal. Optim. 29, 987–1033 (2008)
Ceng, L.-C., Yao, J.-C.: A hybrid iterative scheme for mixed equilibrium problems and fixed point problems. J. Comput. Appl. Math. 214, 186–201 (2008)
Cianciaruso, F., Marino, G., Muglia, L., Yao, Y.: A hybrid projection algorithm for finding solutions of mixed equilibrium problem and variational inequality problem. Fixed Point Theory Appl. 2010, 383740 (2010)
Combettes, P.L., Hirstoaga, S.A.: Equilibrium programming in Hilbert spaces. J. Nonlinear Convex Anal. 6, 117–136 (2005)
Harker, P.T., Pang, J.-S.: Finite-dimensional variational inequality and nonlinear complementarity problems: a survey of theory, algorithms and applications. Math. Program. 48, 161–220 (1990)
He, B.S., Liao, L.Z.: Improvements of some projection methods for monotone nonlinear variational inequalities. J. Optim. Theory Appl. 112, 111–128 (2002)
He, S., Xu, H.-K.: Variational inequalities governed by boundedly Lipschitzian and strongly monotone operators. Fixed Point Theory 10, 245–258 (2009)
Hung, P.G., Muu, L.D.: On inexact Tikhonov and proximal point regularization methods for pseudomonotone equilibrium problems. Vietnam J. Math. 40, 255–274 (2012)
Hussain, N., Khan, A.R.: Applications of the best approximation operator to ∗-nonexpansive maps in Hilbert spaces. Numer. Funct. Anal. Optim. 24, 327–338 (2003)
Jung, J.S.: Convergence of approximating fixed pints for multivalued nonself-mappings in Banach spaces. Korean J. Math. 16, 215–231 (2008)
Kazmi, K.R., Rizvi, S.H.: Iterative approximation of a common solution of a split equilibrium problem, a variational inequality problem and a fixed point problem. J. Egypt. Math. Soc. 21, 44–51 (2013)
Korpelevich, G.M.: The extragradient method for finding saddle points and other problems. Matecon 12, 747–756 (1976)
Kumam, P., Petrot, N., Wangkeeree, R.: A general system of variational inequality problems and mixed equilibrium problems. Nonlinear Anal. Hybrid Syst. 3, 510–530 (2009)
Moudafi, A.: Viscosity approximation methods for fixed-point problems. J. Math. Anal. Appl. 241, 46–55 (2000)
Moudafi, A.: Weak convergence theorems for nonexpansive mapping and equilibrium. J. Nonlinear Convex Anal. 9, 37–43 (2008)
Moudafi, A., Théra, M.: Proximal and dynamical approaches to equilibrium problem. In: Théra, M., Tichatschke, R. (eds.) Ill-posed Variational Problems and Regularization Techniques. Lecture Notes in Economics and Mathematical Systems, vol. 477, pp. 187–201. Springer, Berlin–Heidelberg (1999)
Muu, L.D., Oettli, W.: Convergence of an adaptive penalty scheme for finding constrained equilibria. Nonlinear Anal. TMA 18, 1159–1166 (1992)
Nadler Jr, S.B.: Multi-valued contraction mappings. Pac. J. Math. 30, 475–488 (1969)
Nadezhkina, N., Takahashi, W.: Strong convergence theorem by a hybrid method for nonexpansive mappings and Lipschitz-continuous monotone mappings. SIAM J. Optim. 16, 1230–1241 (2006)
Peng, J.-W., Liou, Y.-C., Yao, J.-C.: An iterative algorithm combining viscosity method with parallel method for a generalized equilibrium problem and strict pseudocontractions. Fixed Point Theory Appl. 2009, 794178 (2009)
Pietramala, P.: Convergence of approximating fixed points sets for multivalued nonexpansive mappings. Comment. Math. Univ. Carolin 32, 697–701 (1991)
Sahu, D.R., O’Regan, D., Agarwal, R.P.: Fixed point theory for lipschitzian-type mappings with applications. Springer, New York (2009)
Shahzad, N., Zegeye, H.: Strong convergence results for nonself multimaps in Banach spaces. Proc. Am. Math. Soc. 136, 539–548 (2008)
Shahzad, N., Zegeye, H.: On Mann and Ishikawa iteration schemes for multi-valued maps in Banach spaces. Nonlinear Anal. TMA 71, 838–844 (2009)
Song, Y., Wang, H.: Convergence of iterative algorithms for multivalued mappings in Banach spaces. Nonlinear Anal. TMA 70, 1547–1556 (2009)
Suzuki, T.: Strong convergence of Krasnoselskii and Man’s type sequences for one-parameter nonexpansive semigroups without Bochner integrals. J. Math. Anal. Appl. 305, 227–239 (2005)
Tada, A., Takahashi, W.: Strong convergence theorem for an equilibrium problem and a nonexpansive mapping. In: Takahashi, W., Tanaka, T. (eds.) Nonlinear Analysis and Convex Analysis. Yokohama Publishers, Yokohama (2005)
Tada, A., Takahashi, W.: Strong convergence theorem for an equilibrium problem and a nonexpansive mapping. J. Optim. Theory Appl. 133, 359–370 (2007)
Takahashi, W.: Nonlinear functional analysis. Yokohama Publishers, Yokohama (2000)
Takahashi, W.: Convex analysis and approximation of fixed points. Yokohama Publishers, Yokohama (2000). in Japanese
Takahashi, W.: Introduction to nonlinear and convex analysis. Okohama Publishers, Yokohama (2005). in Japanese
Takahashi, S., Takahashi, W.: Viscosity approximation methods for equilibrium problems and fixed point problems in Hilbert spaces. J. Math. Anal. Appl. 331, 506–515 (2007)
Takahashi, S., Takahashi, W.: Strong convergennce theorem for a generalized equilibrium problem and a nonexpansive mapping in a Hilbert space. Nonlinear Anal. TMA 69, 1025–1033 (2008)
Xu, H.-K., Kim, T.H.: Convergence of hybrid steepest descent methods for variational inequalities. J. Optim. Theory Appl. 119, 185–201 (2003)
Zegeye, H., Shahzad, N.: Viscosity approximation methods for nonexpansive multimaps in Banach space. Acta Math. Sin. 26, 1165–1176 (2010)
Acknowledgments
The authors would like to thank University of Phayao and the referees for their remarks that helped us very much in revising the paper.
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Buangern, A., Aeimrun, A. & Cholamjiak, W. Iterative Methods for a Generalized Equilibrium Problem and a Nonexpansive Multi-Valued Mapping. Vietnam J. Math. 45, 477–492 (2017). https://doi.org/10.1007/s10013-016-0225-8
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DOI: https://doi.org/10.1007/s10013-016-0225-8
Keywords
- Generalized equilibrium problem
- Variational inequality
- Nonexpansive multi-valued mapping
- Iteration
- Hilbert space