Results 41 to 50 of about 3,096,282 (119)

A Subclass of Bi-Univalent Functions Defined by Generalized Sãlãgean Operator Related to Shell-Like Curves Connected with Fibonacci Numbers

International Journal of Mathematics and Mathematical Sciences, 2019
The aim of this paper is to study certain subclasses of bi-univalent functions defined by generalized Sãlãgean differential operator related to shell-like curves connected with Fibonacci numbers.
Gurmeet Singh, Gurcharanjit Singh, Gagandeep Singh   +2 more
doaj   +1 more source

Coefficient Estimates and Fekete–Szegö Functional Inequalities for a Certain Subclass of Analytic and Bi-Univalent Functions

Axioms, 2022
The present paper introduces a new class of bi-univalent functions defined on a symmetric domain using Gegenbauer polynomials. For functions in this class, we have derived the estimates of the Taylor–Maclaurin coefficients, a2 and a3, and the Fekete ...
Mohamed Illafe, Ala Amourah, Maisarah Haji Mohd   +2 more
doaj   +1 more source

On the Fekete–Szegö problem for concave univalent functions [PDF]

, 2011
We consider the Fekete–Szegö problem with real parameter λ for the class Co(α) of concave univalent ...
Bhowmik, B, Bhowmik, B., Wirths, K.-J., Wirths, KJ, K.-J. Wirths, S. Ponnusamy, Ponnusamy, S, B. Bhowmik, Ponnusamy, S.   +8 more
core   +1 more source

Fekete-Szegö problem for concave univalent functions defined by Salagean operator

, 2014
Also titled: Fekete-Szegö problem for concave univalent functions defined by Sələgean ...
Ibrahim, Alawiah, Dragomir, Sever S, Darus, Maslina   +2 more
core   +5 more sources

Coefficient Estimates for Quasi-Subordination Classes Connected with the Combination of q-Convolution and Error Function

Mathematics, 2023
We utilize quasi-subordination to analyze and introduce several new classes, and we construct a new operator by combining the error function and q-convolution.
Sheza M. El-Deeb, Luminita-Ioana Cotîrlă   +1 more
doaj   +1 more source

Brief von Andrea Szegö an Josef Steindl

BRIEF VON ANDREA SZEGÖ AN JOSEF STEINDL Brief von Andrea Szegö an Josef Steindl ([1]) Letter ([1]) Envelope ([2]
Szegö, Andrea
core   +9 more sources

Fekete-szegö problemi üzerine [PDF]

, 2017
Bu tezde, analitik fonksiyonların özel bir alt sınıfı için Fekete-Szegö problemi ile ilgili bir eşitsizlik elde edilmiş ve elde edilen eşitsizlik için kesin üst sınır bulunmuştur.
Aytaş Düşün, Sultan
core  

The Fekete–Szegö problem for a class of analytic functions defined by Carlson–Shaffer operator [PDF]

, 2014
In the present investigation we solve Fekete-Szegö problem for the generalized linear differential operator. In particular, our theorems contain corresponding results for various subclasses of strongly starlike and strongly convex functions.
Ahuja, Om P., Orhan, Halit
core   +2 more sources

A Two‐Parameter Subclass of q‐Starlike Functions Associated With 1−sinz/cosz

Journal of Function Spaces, Volume 2026, Issue 1, 2026.
Using the real parameters λ and τ with −1 ≤ τ < λ < 1, a generalized q−extension ψqz;λ,τ of the function ψz=1−sinz/cosz, in O´=z∈ℂ:z<1, is defined. The function ψqz;λ,τ is then used as a subordination function to construct a novel subclass; STq∗λ,τ of q−starlike functions.
Nehad Ali Shah, Ahmad Alkhalaf, Usman Afzal, Mohammad Safi Ullah, Richard I. Avery   +4 more
wiley   +1 more source

Coefficient Inequalities Related With Apple‐Like Functions

Journal of Function Spaces, Volume 2026, Issue 1, 2026.
Several subfamilies of Ma and Minda starlike and convex functions have been examined differently through individual generating functions in the literature. However, little or no effort has been devoted to subfamily arising from the product of these generating functions.
Aiman Sana, Afis Saliu, Sadia Riaz, Yufeng Xu   +3 more
wiley   +1 more source