Research Article
BibTex RIS Cite

APPROXIMATING FIXED POINTS OF NONEXPANSIVE MAPPINGS IN UNIFORMLY CONVEX HYPERBOLIC SPACES

Year 2026, Volume: 16 Issue: 3, 305 - 318, 17.03.2026
https://izlik.org/JA24XF42DM

Abstract

This paper investigates the convergence of an iterative process to a fixed point of nonexpansive mappings in uniformly convex hyperbolic spaces. First, we analyze the iteration scheme introduced by Karakaya et al. for such mappings, establishing its key properties. Under specific conditions, we prove both $\Delta-$convergence and strong convergence of the iteration to a fixed point. Additionally, we show that, if the iteration $\Delta-$converges or strongly converges to a fixed point, then every subsequence exhibits the same behavior. These results extend the theory of iterative methods to uniformly convex hyperbolic spaces, broadening their applicability in nonlinear functional analysis.

References

  • Browder, F. E., (1965), Nonexpansive nolinear operators in a Banach space, Proc. Natl. Acad. Sci. USA, 54(4), pp. 1041–1044.
  • Göhde, D., (1965), Zum Prinzip der kontraktiven abildung, Math. Nachr., 30(3-4), pp. 251–258.
  • Kirk, W. A., (1965), A Fixed point theorem for mapping which do not increase distance, Amer. Math. Monthly, 72(9), pp. 1004–1006.
  • Khan, A. R., Fukharuddin, H., and Khan, M. A. A., (2012), An implicit algorithm for two finite families of nonexpansive maps in hyperbolic space, J. Fixed Point Theory Appl., 54. https://doi.org/10.1186/1687-1812-2012-54.
  • Karakaya, V., Atalan, Y., Dogan, K., and Bouzara, N. E. H., (2017), Some fixed point results for a new three steps iteration process in Banach spaces, Fixed Point Theory, 18, pp. 625–640.
  • Atalan, Y. and Karakaya, V., (2019), Investigation of some fixed point theorems in hyperbolic spaces for a three steps iteration process, Korean J. Math., 27(4), pp. 929–947.
  • Kohlenbach, U., (2004), Some logical methatheorem with applications in functional analysis, Trans. Amer. Math. Soc., 534, pp. 89–128.
  • Reich, S. and Shafrir, I., (1990), Nonexpansive iterations in hyperbolic spaces, Nonlinear Anal., 15, pp. 537–558.
  • Mann, W. R., (1953), Mean Valued Methods in Iteration, Proc. Amer. Math. Soc. , 4, pp. 506–610.
  • Ishikawa, S., (1974), Fixed points by A new iteration method, Proc. Amer. Math. Soc. , 44, pp. 147–150.
  • Noor, M. A., (2000), New Approximation Schemes for General Variational Inequalities, J. Math. Anal. Appl., 251, pp. 217–229. https://doi:10.1006 jmaa.2000.7042.
  • Agarwal, R. P., O’Regan, D. , and Sahu, D. R., (2007), Iterative contraction of fixed points of nearly asymptotically nonexpansive mappings, J. Convex Anal., 8, pp. 61–79.
  • Zaheer, S., Chanda, A., Nashine, H. K., (2024), Reckoning applications of Z-iteration: Data dependence and solution to a delay Caputo fractional differential equation, Nonlinear Anal. Model. Control, 29(5), pp. 833–857.
  • Zaheer, S., Chanda, A., Nashine, H. K., (2024), Investigation of data dependence and convergence behavior of M-iteration on Banach spaces with an application, Math. Notes, 116(4), pp. 627–645.
  • Bera A., Chanda, A., Dey, L. K., Ali J., (2022), Iterative approximation of fixed points of a general class of non-expansive mappings in hyperbolic metric spaces, J. Appl. Math. Comput., 68(3), pp. 1817–1839.
  • Gürsoy, F., (2016), A Pichard-S iterative method for approximating fixed point of weak construction mappings, Filomat, 30, pp. 2829–2845.
  • Takashi, W. A., (1970), Convexity in metric space and nonexpansive mappings, Kodai Math. Sem. Rep., 22, pp. 142–149.
  • Goebel, K. and Kirk, W. A., (1983), Iteration processes for nonexpansive mappings, Topol. Methods Nonlinear Anal., 21, pp. 115–123.
  • Goebel, K. and Reich, S., (1984), Uniform Convexity, Hyperbolic Geometry, and Nonexpansive Mappings, Marcel Dekker, New York.
  • Leustean, L. (2007), A quadratic rate of asymptotically regularity for CAT (0) spaces, J. Math. Anal. Appl., 325, pp. 386–399.
  • Chuadchawna, P., Farajzadeh, A., and Kawcharoen, A., (2020), Convergence theorems and approximating endpoints for multivalued Suzuki mappings in hyperbolic spaces, J. Comput. Anal. Appl., 20, pp. 903–916.
  • Pandey, R., Pant, R., Rakocevic, V., and Shukla, R., (2019), Approximating fixed points of a general class of nonexpansive mappings in Banach spaces with applications, Results Math, 74, pp. 1–24.
  • Uddin, I., Aggarwal, S., and Abdou, A. A. N., (2021), Approximation of endpoints for $\alpha-$Reich-Suzuki nonexpansive mapping in hyperbolic metric spaces, Mathematics, 9. https://doi.org/10.3390/math9141692.
  • Naor A. and Silberman L., (2011), Poincar´e inequalities, embeddings, and wild groups, Compos. Math., 147(5) ,1546–1572. https://doi.org/10.1112/S0010437X11005343.
  • Dompongsa, S. and Panyanak, B., (2008), On ∆-convergence theorem in CAT(0) space, Comput. Math. Appl., 56(10), pp. 2572–2579.
  • Senter, H. F., Dotson, W. G., (1974), Approximating fixed points of nonexpansive mappings. Proc. Amer. Math. Soc., 44, pp. 375–380.
There are 26 citations in total.

Details

Primary Language English
Subjects Operator Algebras and Functional Analysis
Journal Section Research Article
Authors

Arfah Arfah 0000-0002-7654-5520

Submission Date November 9, 2024
Acceptance Date August 30, 2025
Publication Date March 17, 2026
IZ https://izlik.org/JA24XF42DM
Published in Issue Year 2026 Volume: 16 Issue: 3

Cite