Online First version
https://doi.org/10.7494/OpMath.202511141
Opuscula Mathematica
Fixed point theory for Jaggi L-type mappings
Enrique Llorens-Fuster
Elena Moreno Gálvez
Abstract. We present a class of nonlinear mappings, properly containing the nonexpansive ones, enjoying the fixed point property in orthogonally convex Banach spaces.
Keywords: fixed point, generalized nonexpansive mapping, normal structure, orthogonal convexity.
Mathematics Subject Classification: 47H10, 47H09, 46B20.
- J.B. Baillon, R. Schoneberg, Asymptotic normal structure and fixed points of nonexpansive mappings, Proc. Amer. Math. Soc. 81 (1981), 257-264. https://doi.org/10.1090/s0002-9939-1981-0593469-1
- H. Fetter, E. Llorens-Fuster, Jaggi nonexpansive mappings revisited, J. Nonlinear Convex Anal. 18 (2017), no. 10, 1771-1779.
- J. García-Falset, E. Llorens-Fuster, T. Suzuki, Fixed point theory for a class of generalized nonexpansive mappings, J. Math. Anal. Appl. 375 (2011) 185-195. https://doi.org/10.1016/j.jmaa.2010.08.069
- D.S. Jaggi, On fixed points of nonexpansive mappings, [in:] Topological Methods in Nonlinear Functional Analysis (Toronto, Ont., 1982), 147-149, Contemp. Math. 21, Amer. Math. Soc., Providence, RI, 1983. https://doi.org/10.1090/conm/021/729510
- A. Jiménez-Melado, Una propiedad geométrica de los espacios de Banach relacionada con la Teoría del Punto Fijo, Ph.D. Dissertation, Univ. de Málaga, Spain (1988).
- A. Jiménez-Melado, E. Llorens-Fuster, The fixed point property for some uniformly nonsquare Banach spaces, Bollettino dell' Unione Matematica Italiana 10-A, (1986), 587-595.
- A. Jiménez-Melado, E. Llorens-Fuster, A sufficient condition for the fixed point property, Nonlinear Anal. Theory Methods Appl. 20 (1993), 849-853. https://doi.org/10.1016/0362-546x(93)90073-2
- A. Jiménez-Melado, E. Llorens-Fuster, Orthogonal convexity vs. orthogonal uniform convexity, J. Nonlinear Convex Anal. 17 (2016), no. 11, 2225-2235.
- A. Jiménez-Melado, E. Llorens-Fuster, James quasireflexive space is orthogonally convex, J. Math. Anal. Appl. 434 (2016), no. 2, 1789-1800. https://doi.org/10.1016/j.jmaa.2015.10.012
- A. Jiménez-Melado, E. Llorens-Fuster, Orthogonally convex Banach sequence spaces, J. Nonlinear Convex Anal. 18 (2017), no. 1, 95-103.
- G. Kassay, A characterization of reflexive Banach spaces with normal structure, Bollettino dell' Unione Matematica Italiana 6 (1986), 273-276.
- M.A. Khamsi, W.A. Kirk, An Introduction to Metric Spaces and Fixed Point Theory, Pure Appl. Math. (N.Y.) Wiley-Interscience, New York, 2001. https://doi.org/10.1002/9781118033074
- W.A. Kirk, A fixed point theorem for mappings which do not increase distance, Amer. Math. Monthly 72 (1965), 1004-1006. https://doi.org/10.2307/2313345
- W.A. Kirk, History and methods of metric fixed point theory. Antipodal points and fixed points, Lecture Notes Ser. 28, Seoul National University, Research Institute of Mathematics, Global Analysis Research Center, Seoul, 1995, 21-54. https://doi.org/10.1007/bfb0092174
- W.A. Kirk, N. Shazad, Normal structure and orbital fixed point conditions, J. Math. Anal. Appl. 463 (2018), 461-476. https://doi.org/10.1016/j.jmaa.2018.02.022
- D. Kutzarova, S. Prus, B. Sims, Remarks on orthogonal convexity of Banach spaces, Houst. J. Math. 19 (1993), 603-613.
- E. Llorens-Fuster, Goebel-Karlovitz and Maurey theorems revisited, Rev. Real Acad. Cienc. Exactas Fis. Nat. Ser. A-Mat. 120 (2026), Article no. 30. https://doi.org/10.1007/s13398-025-01824-y
- E. Llorens-Fuster, The fixed point property for renormings of \(ll_2\), Arab. J. Math. 1 (2012), 511-528. https://doi.org/10.1007/s40065-012-0054-x
- E. Llorens-Fuster, E. Moreno-Gálvez, The fixed point theory for some generalized nonexpansive mappings, Abstract Appl. Anal. 2011 (2011), Article ID 435686. https://doi.org/10.1155/2011/435686
- E. Llorens Fuster, E. Moreno Gálvez, The fixed point property for some generalized nonexpansive mappings in a nonreflexive Banach space, Fixed Point Theory 14 (2013), 141-150.
- G. Marino, B. Scardamaglia, R. Zaccone, A general viscosity explicit midpoint rule for quasi-nonexpansive mappings, J. Nonlinear Convex Anal. 18 (2017), no. 1, 137-148.
- B. Nawaz, K. Gdawiec, K. Ullah, Effectiveness of Picard-Abbas iteration for fixed point approximation of mappings satisfying condition (E), J. Comput. Appl. Math. 469 (2025), 116649. https://doi.org/10.1016/j.cam.2025.116649
- B. Piątek, Iterated nonexpansive mappings in Hilbert spaces, J. Fixed Point Theory Appl. 23 (2021), Paper no. 61.
- B. Piątek, Some generalized nonexpansive mappings and weak normal structure, Topol. Methods Nonlinear Anal. 63 (2024), 285-298.
- R. Shukla, The fixed point property for nonexpansive type mappings in nonrefexive Banach spaces, Rendiconti del Circolo Matematico di Palermo Series 2 70 (2021), 1413-1424. https://doi.org/10.1007/s12215-020-00566-7
- R. Shukla, R. Panicker, D. Vijayasenan, Demiclosed principle and some fixed-point theorems for generalized nonexpansive mappings in Banach spaces, Fixed Point Theory Algorithms Sci. (2024), Paper no. 10. https://doi.org/10.1186/s13663-024-00765-2
- M.A. Smyth, The fixed point problem for generalised nonexpansive maps, Bull. Austral. Math. Soc. 55 (1997), 45-61. https://doi.org/10.1017/s0004972700030525
- T. Suzuki, Fixed point theorems and convergence theorems for some generalized nonexpansive mappings, J. Math. Anal. Appl. 340 (2008), 1088-1095. https://doi.org/10.1016/j.jmaa.2007.09.023
- J. Zou, Y. Cui, Fixed point theorems for (L)-type mappings in complete CAT(0) spaces, J. Nonlinear Sci. Appl. 10 (2017), 964-974. https://doi.org/10.22436/jnsa.010.03.09
- Enrique Llorens-Fuster (corresponding author)
https://orcid.org/0000-0001-6194-0002- University of Valencia, Department of Mathematical Analysis, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain
- Elena Moreno Gálvez
https://orcid.org/0000-0001-5692-3857- Catholic University of Valencia, Department of Mathematics, Natural Sciences and Social Sciences Applied to Education, Sagrado Corazón 5, 46110 Godella, Valencia, Spain
- Communicated by Marek Galewski.
- Received: 2025-07-10.
- Revised: 2025-11-07.
- Accepted: 2025-11-14.
- Published online: 2026-03-18.

