New Trends in Fixed Point Theory in Fuzzy Metric Spaces and Their Generalizations

A special issue of Axioms (ISSN 2075-1680). This special issue belongs to the section "Mathematical Analysis".

Deadline for manuscript submissions: 31 December 2026 | Viewed by 1125

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Instituto de Investigación para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València, C/Paranimf, Grao de Gandia, 46730 Valencia, Spain
Interests: topology; aggregation operators; fixed point theory; multiagent systems; fuzzy metric space; fuzzy topology
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Special Issue Information

Dear Colleagues,

The study of fuzzy metric spaces—first introduced by Kramosil and Michalek and subsequently modified in various ways throughout the literature—has become an active area of research in mathematics, particularly from the topological point of view. Although it is well known that fuzzy metrics and classical metrics are topologically equivalent, they show significant differences from a purely metric perspective. In particular, fixed-point theory in fuzzy metric spaces reveals important distinctions from its classical counterpart, making it an intensive field of research in recent years. Furthermore, several authors have proposed generalizations of fuzzy metrics from different viewpoints, including fuzzy quasi-metrics, fuzzy partial metrics, fuzzy b-metrics, vector-valued fuzzy metrics, and others.

This Special Issue aims to bring together recent advances in fixed point theory within the framework of fuzzy metric spaces and their generalizations. Specifically, it seeks to publish high-quality papers devoted to establishing and analyzing new fixed-point results in (generalized) fuzzy metric spaces, as well as their applications to differential and integral equations, optimization, and decision-making under uncertainty. Contributions addressing stability, uniqueness, and convergence results in fuzzy contexts, as well as papers exploring connections between fuzzy fixed-point theory and emerging areas such as artificial intelligence, data science, and control theory, will also be considered.

Prof. Dr. Juan José Miñana
Guest Editor

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Keywords

  • fuzzy metric space
  • fixed-point
  • contractive mapping
  • generalized fuzzy metric spaces
  • common fixed points
  • completeness
  • stability analysis
  • convergence and uniqueness results
  • optimization
  • nonlinear analysis

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Published Papers (2 papers)

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Research

15 pages, 269 KB  
Article
Nonexpansive Mappings and Fixed Point Theory in Fuzzy Normed GE-Algebras
by Prashant Patel, Amal S. Alali and Ravi Kumar Bandaru
Axioms 2026, 15(7), 493; https://doi.org/10.3390/axioms15070493 - 1 Jul 2026
Viewed by 228
Abstract
In this paper, we investigate the theory of nonexpansive mappings in the framework of fuzzy normed GE-algebras. After recalling the fundamental concepts of GE-algebras and fuzzy GE-norms, we introduce the notion of fuzzy nonexpansive mappings and examine their basic structural properties. We show [...] Read more.
In this paper, we investigate the theory of nonexpansive mappings in the framework of fuzzy normed GE-algebras. After recalling the fundamental concepts of GE-algebras and fuzzy GE-norms, we introduce the notion of fuzzy nonexpansive mappings and examine their basic structural properties. We show that the composition of two fuzzy nonexpansive mappings remains fuzzy nonexpansive, and establish that every fuzzy nonexpansive mapping is sequentially continuous with respect to fuzzy convergence. Further, by employing the concept of a fuzzy GE-interpolation family, we define α-averaged mappings in fuzzy normed GE-algebras and prove that such averaged operators preserve nonexpansiveness. We also develop a demiclosedness-type principle and provide fixed point equivalence results between a mapping and its associated averaged mapping under suitable assumptions. Finally, we prove that the fixed point set of a fuzzy nonexpansive mapping is sequentially closed. These results extend classical ideas from metric fixed-point theory and Banach space theory to the algebraic setting of fuzzy normed GE-algebras. Full article
18 pages, 324 KB  
Article
Hicks-Type Fixed Point Results and Uniform Structure in Intuitionistic Fuzzy b-Metric Spaces
by Şuara Onbaşıoğlu Altuhovs and Banu Pazar Varol
Axioms 2026, 15(6), 399; https://doi.org/10.3390/axioms15060399 - 26 May 2026
Viewed by 281
Abstract
In this paper, we propose a new class of intuitionistic fuzzy b-metric spaces in the sense of Romaguera and investigate their fixed-point properties. Within this framework, we define and analyze Hicks-type contraction mappings. In addition, the concept of K-stationary intuitionistic fuzzy b-metrics [...] Read more.
In this paper, we propose a new class of intuitionistic fuzzy b-metric spaces in the sense of Romaguera and investigate their fixed-point properties. Within this framework, we define and analyze Hicks-type contraction mappings. In addition, the concept of K-stationary intuitionistic fuzzy b-metrics is introduced and examined through illustrative examples. Our findings generalize classical results in fuzzy b-metric spaces and extend fixed-point theorems to the intuitionistic fuzzy setting. This study enriches fixed-point theory in intuitionistic fuzzy environments and provides a basis for further theoretical investigations and applications. Full article
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