New Theory and Applications of Nonlinear Analysis, Fractional Calculus and Optimization, 2nd Edition

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

Deadline for manuscript submissions: 31 July 2025 | Viewed by 4647

Special Issue Editor


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Guest Editor
Department of Mathematics, National Kaohsiung Normal University, Kaohsiung 824004, Taiwan
Interests: nonlinear analysis; fixed point theory and its applications; variational principles and inequalities; optimization theory; fractional calculus theory
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Special Issue Information

Dear Colleagues,

This Special Issue is a continuation of the previous successful Special Issue "New Theory and Applications of Nonlinear Analysis, Fractional Calculus and Optimization".

Nonlinear analysis has widespread and significant applications in many areas at the core of many branches of pure and applied mathematics and modern science, including nonlinear ordinary and partial differential equations, critical point theory, functional analysis, fixed point theory, nonlinear optimization, fractional calculus, variational analysis, convex analysis, dynamical system theory, mathematical economics, data mining, signal processing, control theory, and so on. The rapid development of fractional calculus and its applications during the past more-than thirty years has led to a number of scholarly essays that study the importance of its promotion and application in physical chemistry, probability and statistics, electromagnetic theory, financial economics, biological engineering, electronic networks, and so forth. Almost all areas of modern science and engineering have been influenced by the theory of fractional calculus. Due to the complexity of the various problems that arise in nonlinear analysis, fractional calculus and optimization, it is not always easy to find exact solutions, so we often resort to approximate solutions. Over the past eighty years, optimization problems have been intensively studied, and many scholars have developed various feasible methods to analyze the convergence of algorithms and find approximate solutions.

This Special Issue will pay more attention to the new originality and real-world applications of nonlinear analysis, fractional calculus, optimization, and their applications. We cordially and earnestly invite researchers to contribute original and high-quality research papers, which will inspire advances in nonlinear analysis, fractional calculus, optimization, and their applications. Potential topics include, but are not limited to, the following:

  • Nonlinear functional analysis;
  • Fixed point, coincidence point, and best proximity point theory;
  • Set-valued analysis;
  • Critical point theory;
  • Matrix theory;
  • Convex analysis;
  • Boundary value problems;
  • Singular and impulsive fractional differential and integral equations;
  • Well-posedness of fractional systems;
  • Fractional epidemic model;
  • Modeling biological phenomena;
  • Non-smooth analysis and optimization;
  • Stability analysis;
  • Dynamics and chaos;
  • Machine learning;
  • Artificial neural networks.

Prof. Dr. Wei-Shih Du
Guest Editor

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Keywords

  • functional analysis
  • fixed point theory and its applications
  • set-valued analysis
  • critical point theory
  • matrix theory
  • convex analysis
  • fractional differential equation
  • well-posedness of fractional system
  • fractional epidemic model
  • non-smooth analysis and optimization
  • graph theory and optimization
  • stability analysis
  • dynamics and chaos
  • machine learning
  • artificial neural networks

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Related Special Issue

Published Papers (6 papers)

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Research

17 pages, 430 KiB  
Article
Young and Inverse Young Inequalities on Euclidean Jordan Algebra
by Chien-Hao Huang
Axioms 2025, 14(4), 312; https://doi.org/10.3390/axioms14040312 - 18 Apr 2025
Viewed by 172
Abstract
This paper mainly focuses on in-depth research on inequalities on symmetric cones. We will further analyze and discuss the inequalities we developed on the second-order cone and develop more inequalities. According to our past research in dealing with second-order cone inequalities, we derive [...] Read more.
This paper mainly focuses on in-depth research on inequalities on symmetric cones. We will further analyze and discuss the inequalities we developed on the second-order cone and develop more inequalities. According to our past research in dealing with second-order cone inequalities, we derive more inequalities concerning the eigenvalue version of Young’s inequality and trace a version of an inverse Young inequality and its applications. These conclusions align with the results established for the positive semidefinite cone, which is also a symmetric cone. It is of considerable help to the establishment of inequalities on symmetric cones and the analysis of their derivative algorithms. Full article
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12 pages, 273 KiB  
Article
Resolvents for Convex Functions on Geodesic Spaces and Their Nonspreadingness
by Takuto Kajimura, Yasunori Kimura and Fumiaki Kohsaka
Axioms 2025, 14(4), 295; https://doi.org/10.3390/axioms14040295 - 14 Apr 2025
Viewed by 168
Abstract
The convex optimization problems have been considered by many researchers on geodesic spaces. In these problems, the resolvent operators play an important role. In this paper, we propose new resolvents on geodesic spaces, and we show that they have better properties than other [...] Read more.
The convex optimization problems have been considered by many researchers on geodesic spaces. In these problems, the resolvent operators play an important role. In this paper, we propose new resolvents on geodesic spaces, and we show that they have better properties than other known resolvent operators. Full article
16 pages, 934 KiB  
Article
Mathematical Modeling of Fractals via Proximal F-Iterated Function Systems
by Muhammad Zahid, Fahim Ud Din, Mudasir Younis, Haroon Ahmad and Mahpeyker Öztürk
Axioms 2024, 13(12), 881; https://doi.org/10.3390/axioms13120881 - 19 Dec 2024
Cited by 2 | Viewed by 948
Abstract
We propose a novel approach to fractals by leveraging the approximation of fixed points, emphasizing the deep connections between fractal theory and fixed-point theory. We include a condition of isomorphism, which not only generates traditional fractals but also introduces the concept of generating [...] Read more.
We propose a novel approach to fractals by leveraging the approximation of fixed points, emphasizing the deep connections between fractal theory and fixed-point theory. We include a condition of isomorphism, which not only generates traditional fractals but also introduces the concept of generating two fractals simultaneously, using the framework of the best proximity point: one as the original and the other as its best proximity counterpart. We present a notion of the Proximal FIterated Function System (FPIFS), which is constructed using a finite set of F*weak proximal contractions. This extends the classical notions of Iterated Function Systems (IFSs) and Proximal Iterated Function Systems (PIFSs), which are commonly used to create fractals. Our findings show that under specific conditions in a metric space, the FPIFS has a unique best attractor. In order to illustrate our findings, we provide an example showing how these fractals are generated together. Furthermore, we intend to investigate the possible domains in which our findings may be used. Full article
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11 pages, 271 KiB  
Article
On Qi’s Normalized Remainder of Maclaurin Power Series Expansion of Logarithm of Secant Function
by Hong-Chao Zhang, Bai-Ni Guo and Wei-Shih Du
Axioms 2024, 13(12), 860; https://doi.org/10.3390/axioms13120860 - 8 Dec 2024
Cited by 2 | Viewed by 816
Abstract
In the study, the authors introduce Qi’s normalized remainder of the Maclaurin power series expansion of the function lnsecx=lncosx; in view of a monotonicity rule for the ratio of two Maclaurin power series and by [...] Read more.
In the study, the authors introduce Qi’s normalized remainder of the Maclaurin power series expansion of the function lnsecx=lncosx; in view of a monotonicity rule for the ratio of two Maclaurin power series and by virtue of the logarithmic convexity of the function (2x1)ζ(x) on (1,), they prove the logarithmic convexity of Qi’s normalized remainder; with the aid of a monotonicity rule for the ratio of two Maclaurin power series, the authors present the monotonic property of the ratio between two Qi’s normalized remainders. Full article
16 pages, 508 KiB  
Article
Refined Iterative Method for a Common Variational Inclusion and Common Fixed-Point Problem with Practical Applications
by Chaiporn Thangthong, Raweerote Suparatulatorn, Tanadon Chaobankoh and Khuanchanok Chaichana
Axioms 2024, 13(11), 740; https://doi.org/10.3390/axioms13110740 - 29 Oct 2024
Viewed by 777
Abstract
This paper introduces a novel parallel method for solving common variational inclusion and common fixed-point (CVI-CFP) problems. The proposed algorithm provides a strong convergence theorem established under specific conditions associated with the CVI-CFP problem. Numerical simulations demonstrate the algorithm’s efficacy in the context [...] Read more.
This paper introduces a novel parallel method for solving common variational inclusion and common fixed-point (CVI-CFP) problems. The proposed algorithm provides a strong convergence theorem established under specific conditions associated with the CVI-CFP problem. Numerical simulations demonstrate the algorithm’s efficacy in the context of signal recovery problems involving various types of blurred filters. The results highlight the algorithm’s potential for practical applications in image processing and other fields. Full article
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16 pages, 284 KiB  
Article
On the Generalized Stabilities of Functional Equations via Isometries
by Muhammad Sarfraz, Jiang Zhou, Yongjin Li and John Michael Rassias
Axioms 2024, 13(6), 403; https://doi.org/10.3390/axioms13060403 - 14 Jun 2024
Cited by 3 | Viewed by 1082
Abstract
The main goal of this research article is to investigate the stability of generalized norm-additive functional equations. This study demonstrates that these equations are Hyers-Ulam stable for surjective functions from an arbitrary group G to a real Banach space B using the large [...] Read more.
The main goal of this research article is to investigate the stability of generalized norm-additive functional equations. This study demonstrates that these equations are Hyers-Ulam stable for surjective functions from an arbitrary group G to a real Banach space B using the large perturbation method. Furthermore, hyperstability results are investigated for a generalized Cauchy equation. Full article
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