Fractional Order Functional Differential Equations and Fixed Point Theory

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

Deadline for manuscript submissions: 31 December 2025 | Viewed by 565

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Department of Mathematics, School of Electronics & Information Engineering, Taizhou University, Taizhou 318000, China
Interests: ecological differential dynamical system; neural network system; fractional order dynamical system; functional differential equation; parabolic partial differential equation
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Special Issue Information

Dear Colleagues,

The fractional order functional differential equation is an important kind of functional differential equation, which is a generalization of integer-order differential equation. Fractional order functional differential equations are widely used in physics, chemistry, biology, and engineering technology, especially as superior mathematical tools for describing phenomena and processes with memory or viscoelastic properties. Therefore, it is of great theoretical and practical value to study the dynamic behaviour of fractional order functional differential equations. In addition, fixed point theory is an important and powerful tool to discuss the solvability of fractional order functional differential equations. This Special Issue is a platform to enhance the communication and presentation of the latest research results of fractional functional differential equations. The main scope of this Special Issue (including but not limited to the points below) is outlined:

  • Delay fractional differential and difference equations;
  • Impulsive fractional differential and difference equations;
  • Neutral fractional differential and difference equations;
  • Applying fixed point theory to solve fractional differential and difference equations;
  • Solvability and stability;
  • Numerical solutions and simulations of fractional order functional differential equations;
  • The practical application of fractional order functional differential equations.

Prof. Dr. Kaihong Zhao
Prof. Dr. Quanxin Zhu
Guest Editors

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Keywords

  • delay fractional differential and difference equations
  • impulsive fractional differential and difference equations
  • neutral fractional differential and difference equations
  • applying fixed point theory to solve fractional differential and difference equations
  • solvability and stability
  • numerical solutions and simulations of fractional order functional differential equations
  • the practical application of fractional order functional differential equations

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Published Papers (1 paper)

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19 pages, 330 KiB  
Article
On the Existence of (p,q)-Solutions for the Post-Quantum Langevin Equation: A Fixed-Point-Based Approach
by Mohammed Jasim Mohammed, Ali Ghafarpanah, Sina Etemad, Sotiris K. Ntouyas and Jessada Tariboon
Axioms 2025, 14(6), 474; https://doi.org/10.3390/axioms14060474 - 19 Jun 2025
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Abstract
The two-parameter (p,q)-operators are a new family of operators in calculus that have shown their capabilities in modeling various systems in recent years. Following this path, in this paper, we present a new construction of the Langevin equation [...] Read more.
The two-parameter (p,q)-operators are a new family of operators in calculus that have shown their capabilities in modeling various systems in recent years. Following this path, in this paper, we present a new construction of the Langevin equation using two-parameter (p,q)-Caputo derivatives. For this new Langevin equation, equivalently, we obtain the solution structure as a post-quantum integral equation and then conduct an existence analysis via a fixed-point-based approach. The use of theorems such as the Krasnoselskii and Leray–Schauder fixed-point theorems will guarantee the existence of solutions to this equation, whose uniqueness is later proven by Banach’s contraction principle. Finally, we provide three examples in different structures and validate the results numerically. Full article
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