Generalized Fractional Operators and Special Functions: Theory, Methods, and Applications

A special issue of Axioms (ISSN 2075-1680).

Deadline for manuscript submissions: 31 March 2026 | Viewed by 615

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Guest Editor
IT4-Innovations, VSB-Technical University of Ostrava, 70800 Ostrava-Poruba, Czech Republic
Interests: nonlinear dynamics; dynamical systems; bifurcation analysis; chaos theory; nonlinear analysis
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Special Issue Information

Dear Colleagues, 

Fractional calculus has rapidly evolved as a powerful mathematical tool for describing memory and hereditary properties inherent in diverse natural and engineered systems. Its flexible operators extend classical differentiation and integration to non-integer orders, offering new avenues in modeling complex phenomena in physics, engineering, biology, economics, and applied sciences. At the same time, special functions—such as hypergeometric functions, Mittag-Leffler functions, Bessel functions, and generalized orthogonal polynomials—play a pivotal role in solving fractional differential equations and in characterizing solutions with analytical depth and computational tractability. The intersection of fractional calculus with special functions has produced groundbreaking results in the development of exact solutions, numerical schemes, stability analysis, and applications across multiple disciplines. This Special Issue aims to bring together leading researchers to present recent advances, novel methods, and applications that highlight the synergy between fractional operators and special functions. 

The scope and potential topics include (but are not limited to) the following:

New definitions and generalizations of fractional operators. Analytical and numerical solutions of fractional differential and integral equations using special functions. Inequalities, convexity, and approximation theory in the fractional framework. Applications of special functions (Mittag-Leffler, Wright, Fox H-function, etc.) in fractional modeling. Fractional models in fluid dynamics, control theory, viscoelasticity, and heat/mass transfer. Fractal and fractional approaches in physics, finance, and biological systems. Computational algorithms and stability analysis of fractional systems. Connections between fractional calculus, operator theory, and integral transforms.

Objective:

The objective of this Special Issue is to provide a comprehensive platform for disseminating theoretical advancements, methodological innovations, and real-world applications that emerge from the interplay of fractional calculus and special functions.

Dr. Adil Jhangeer
Guest Editor

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Keywords

  • generalized fractional operators
  • fractional differential equations
  • operational calculus
  • integral transforms
  • special functions
  • real world applications

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Published Papers (2 papers)

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Research

23 pages, 910 KB  
Article
Fractal Modeling of Generalized Weighted Pre-Invex Functions with Applications to Random Variables and Special Means
by Muhammad Muddassar, Maria Bibi, Kashif Nazar and Adil Jhangeer
Axioms 2025, 14(12), 897; https://doi.org/10.3390/axioms14120897 - 2 Dec 2025
Viewed by 188
Abstract
This article introduces certain algebraic properties of generalized (h˜1,h˜2)-pre-invex functions on R(0<1). A new fractal weighted integral identity is established and further employed to obtain [...] Read more.
This article introduces certain algebraic properties of generalized (h˜1,h˜2)-pre-invex functions on R(0<1). A new fractal weighted integral identity is established and further employed to obtain several Ostrowski-type results in the fractal setting for functions whose first derivatives in the modulus belong to the generalized (h˜1,h˜2)-pre-invex functions’s class. An illustrative example is presented to validate the theoretical findings. Moreover, applications of the main results are derived in connection with generalized random variables and various special means, highlighting the effectiveness and potential scope of the proposed approach. Full article
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17 pages, 293 KB  
Article
Element-Oriented Construction Methods for Nullnorms on Bounded Lattices
by Ümit Ertuğrul, Merve Yeşilyurt and Radko Mesiar
Axioms 2025, 14(12), 856; https://doi.org/10.3390/axioms14120856 - 21 Nov 2025
Viewed by 185
Abstract
Nullnorms are aggregation functions with an annihilator and are generalizations of t-norms and t-conorms. After the introduction of the concept of nullnorms on bounded lattices by Karaçal et al., the studies on their construction methods in such structures have been initiated. Following the [...] Read more.
Nullnorms are aggregation functions with an annihilator and are generalizations of t-norms and t-conorms. After the introduction of the concept of nullnorms on bounded lattices by Karaçal et al., the studies on their construction methods in such structures have been initiated. Following the paper of Karaçal and Şanlı, in which proposed element-based construction methods for t-norms and t-conorms on bounded lattices, a natural research question emerged: Are there any element-based construction methods for nullnorms on a bounded lattice L? In this paper, we address this question and propose construction methods for nullnorms with an annihilator element kL{0,1}, depending on an element ηL{0,k,1}, by examining the relationship between η and k. The proposed methods are compared with some existing approaches in the literature and are shown to be distinct. These theoretical findings are further supported with illustrative examples. Full article
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