Current Topics in Geometric Function Theory, 2nd Edition

A special issue of Mathematics (ISSN 2227-7390). This special issue belongs to the section "C4: Complex Analysis".

Deadline for manuscript submissions: 31 October 2025 | Viewed by 933

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Department of Mathematics, Faculty of Computer Science and Engineering, “1 Decembrie 1918” University of Alba Iulia, 510009 Alba Iulia, Romania
Interests: analytic functions; univalence; convexity; starlikeness; integral operators; regression modeling; smoothing spline
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Special Issue Information

Dear Colleagues,

One of the most studied branches in the theory of functions of one complex variable, concerned with the study of the geometric properties of analytical functions in complex analysis, the geometric theory of analytic functions (also called geometric function theory (GFT)) has the Riemann mapping theorem at its core, formulated by B. Riemann in 1851 and approached later by others, such as C. Carathéodory, P. Koebe, and L. Bieberbach. The duality of this field, based on the tradeoff between an analytical approach and geometric intuition, constitutes an advantage when we want to study the geometrical behavior of various classes of functions. The current development of the geometric function theory involving both classic and modern topics also generates many connections with various fields of mathematics, including special functions, probability distributions, fractional, and q-calculus. Even if the geometric function theory is mostly viewed as a theoretical domain, significant practical applications were also obtained from the theoretical results in different fields, such as fluid mechanics, nuclear physics, mathematical physics, astrophysics, and, more recently, in control theory, signal and image processing, and others.

This Special Issue aims to be a collection of original and recent research in the current topics of the field of geometric function theory related, but not restricted, to univalent function theory; the study of star-like, convex, and other classes of analytic functions with geometric properties; the study of integral operators; differential subordination and superordination; and the newly flourishing research area based on q-calculus and fractional calculus. Research papers focusing on the geometric function theory used in real-life applications are also encouraged for this Special Issue.

We are looking forward to receiving original contributions that can broaden the horizons of this research area. 

Prof. Dr. Nicoleta Breaz
Guest Editor

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Keywords

  • classes of analytic functions
  • univalent functions
  • differential subordination and superordination
  • operator-related problems
  • quantum calculus
  • fractional calculus
  • extremal problems
  • preserving class properties
  • coefficients estimates
  • GFT in real-life applications

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Published Papers (3 papers)

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16 pages, 613 KiB  
Article
A Study of Certain Geometric Properties and Hardy Spaces of the Normalized Miller-Ross Function
by Muhammad Abubakr, Mohsan Raza, Abdulaziz Alenazi and Khaled Mehrez
Mathematics 2025, 13(12), 1919; https://doi.org/10.3390/math13121919 - 8 Jun 2025
Viewed by 116
Abstract
The main objective of this research is to investigate specific sufficiency criteria for the strongly starlikeness, strongly convexity, starlikeness, convexity and pre-starlikeness of the normalized Miller-Ross function. Furthermore, we establish sufficient conditions under which the normalized Miller-Ross function belongs to Hardy spaces and [...] Read more.
The main objective of this research is to investigate specific sufficiency criteria for the strongly starlikeness, strongly convexity, starlikeness, convexity and pre-starlikeness of the normalized Miller-Ross function. Furthermore, we establish sufficient conditions under which the normalized Miller-Ross function belongs to Hardy spaces and the class-bounded analytic functions. Some of the various results which are derived in this paper are presumably new and their significance is illustrated through several interesting examples. Full article
(This article belongs to the Special Issue Current Topics in Geometric Function Theory, 2nd Edition)
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19 pages, 322 KiB  
Article
Application on Fuzzy Third-Order Subordination and Superordination Connected with Lommel Function
by Ekram E. Ali, Georgia Irina Oros, Rabha M. El-Ashwah and Abeer M. Albalahi
Mathematics 2025, 13(12), 1917; https://doi.org/10.3390/math13121917 - 8 Jun 2025
Viewed by 111
Abstract
This work is based on the recently introduced concepts of third-order fuzzy differential subordination and its dual, third-order fuzzy differential superordination. In order to obtain the new results that add to the development of the newly initiated lines of research, a new operator [...] Read more.
This work is based on the recently introduced concepts of third-order fuzzy differential subordination and its dual, third-order fuzzy differential superordination. In order to obtain the new results that add to the development of the newly initiated lines of research, a new operator is defined here using the concept of convolution and the normalized Lommel function. The methods focusing on the basic concept of admissible function are employed. Hence, the investigation of new third-order fuzzy differential subordination results starts with the definition of the suitable class of admissible functions. The first theorems discuss third-order fuzzy differential subordinations involving the newly introduced operator. The following result shows the conditions needed such that the fuzzy best dominant can be found for a third-order fuzzy differential subordination. Next, dual results are obtained by employing the methods of third-order fuzzy differential superordination based on the same concept of an admissible function. A suitable class of admissible functions is introduced and new third-order fuzzy differential superordinations are obtained, showing how the best subordinant can be obtained under certain restrictions. As a conclusion of this study, sandwhich-type results are derived, linking the outcome of the two dual fuzzy theories. Full article
(This article belongs to the Special Issue Current Topics in Geometric Function Theory, 2nd Edition)
12 pages, 671 KiB  
Article
Inequalities of a Class of Analytic Functions Involving Multiplicative Derivative
by Kadhavoor R. Karthikeyan, Daniel Breaz, Gangadharan Murugusundaramoorthy and Ganapathi Thirupathi
Mathematics 2025, 13(10), 1606; https://doi.org/10.3390/math13101606 - 14 May 2025
Viewed by 220
Abstract
Using the concepts of multiplicative calculus and subordination of analytic functions, we define a new class of starlike bi-univalent functions based on a symmetric operator, which involved the three parameter Mittag-Leffler function. Estimates for the initial coefficients and Fekete–Szegő inequalities of the defined [...] Read more.
Using the concepts of multiplicative calculus and subordination of analytic functions, we define a new class of starlike bi-univalent functions based on a symmetric operator, which involved the three parameter Mittag-Leffler function. Estimates for the initial coefficients and Fekete–Szegő inequalities of the defined function classes are determined. Moreover, special cases of the classes have been discussed and stated as corollaries, which have not been discussed previously. Full article
(This article belongs to the Special Issue Current Topics in Geometric Function Theory, 2nd Edition)
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