Research in Fixed Point Theory and Its Applications

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

Deadline for manuscript submissions: 31 March 2026 | Viewed by 329

Special Issue Editor


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Guest Editor
SYSTEC-ARISE Research Center for Systems and Technologies, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
Interests: pure mathematics; mathematical analysis; topology; fixed point theory; machine learning

Special Issue Information

Dear Colleagues,

Fixed point theory stands as a cornerstone in various mathematical disciplines such as topology, functional analysis, and nonlinear analysis. It serves as a fundamental tool in dynamic optimization, optimal control, solution of partial or random differential equations, differential and integral equations theory, and approximation schemes for functional equations. The applications of fixed-point theory span across diverse fields, including engineering, biological systems, management, economics, finance, and computer science, among others.

In recent years, there has been a surge in the development and utilization of generalized metric spaces to model various phenomena across different domains. These generalizations have found applications in integral equations, fixed-point theorems for both single-valued and set-valued maps, and in principles, like Ekeland’s variational principle.

This Special Issue of the journal seeks to gather review, expository, and original research papers that delve into the cutting-edge advancements in fixed point theory and its applications across physical, natural, computational, environmental, engineering, and statistical sciences. Topics of interest include, but are not limited to, the following:

  • Metric Spaces;
  • Fixed Point Theorems;
  • Well-posedness Stability;
  • Optimization;
  • Dynamic Programming Fluid Mechanics;
  • Numerical and Computational Methods;
  • Mathematical Physics;
  • Mathematics in Biology;
  • Mathematics in Biology Contractive Mappings.

We cordially invite submissions that explore these areas and their intersections with fixed point theory.

Dr. Abdelkader Belhenniche
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metric spaces
  • fixed point theory
  • stability
  • optimization and optimal control
  • machine learning
  • numerical and computational methods

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Published Papers (2 papers)

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Research

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Article
Reformulation of Fixed Point Existence: From Banach to Kannan and Chatterjea Contractions
by Zouaoui Bekri, Nicola Fabiano, Mohammed Ahmed Alomair and Abdulaziz Khalid Alsharidi
Axioms 2025, 14(10), 717; https://doi.org/10.3390/axioms14100717 - 23 Sep 2025
Abstract
This paper presents a reformulation of classical existence and uniqueness results for second-order boundary value problems (BVPs) using the Kannan fixed point theorem, extending beyond the Banach contraction principle. We shift focus from the nonlinearity j to the solution operator T defined via [...] Read more.
This paper presents a reformulation of classical existence and uniqueness results for second-order boundary value problems (BVPs) using the Kannan fixed point theorem, extending beyond the Banach contraction principle. We shift focus from the nonlinearity j to the solution operator T defined via Green’s function and establish a sufficient condition under which T satisfies the Kannan contraction criterion. Specifically, if the derivative of j is bounded by K and K·(ηζ)2/8<1/3, then T is a Kannan contraction, ensuring a unique solution. This condition applies even when the Banach contraction principle fails. We also explore the plausibility of applying the Chatterjea contraction, though rigorous verification remains open. Examples illustrate the applicability of the results. This work highlights the utility of generalized contractions in differential equations. Full article
(This article belongs to the Special Issue Research in Fixed Point Theory and Its Applications)
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15 pages, 364 KB  
Article
Graph-Theoretic Perspectives on Fixed Points in Double-Composed Metric Spaces
by Nizar Souayah
Axioms 2025, 14(9), 698; https://doi.org/10.3390/axioms14090698 - 16 Sep 2025
Viewed by 176
Abstract
This study explores the development of fixed-point results in the setting of the recently proposed double-composed metric spaces. We establish conditions ensuring both existence and uniqueness of fixed points for several types of contractive mappings defined on such spaces. To enrich the analysis, [...] Read more.
This study explores the development of fixed-point results in the setting of the recently proposed double-composed metric spaces. We establish conditions ensuring both existence and uniqueness of fixed points for several types of contractive mappings defined on such spaces. To enrich the analysis, the space is further equipped with a graph structure through the use of concepts from graph theory, leading to the formulation of two novel fixed-point theorems. An illustrative example is also provided to highlight the applicability and relevance of the obtained results. Full article
(This article belongs to the Special Issue Research in Fixed Point Theory and Its Applications)
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