Results 21 to 30 of about 50,851 (256)

Quasi-convex univalent functions

International Journal of Mathematics and Mathematical Sciences, 1980
In this paper, a new class of normalized univalent functions is introduced. The properties of this class and its relationship with some other subclasses of univalent functions are studied. The functions in this class are close-to-convex.
K. Inayat Noor, D. K. Thomas
doaj   +1 more source

Radius problems for a subclass of close-to-convex univalent functions

International Journal of Mathematics and Mathematical Sciences, 1992
Let P[A,B], −1≤Bβ, 0 ...
Khalida Inayat Noor
doaj   +1 more source

Coefficient inequalities for Janowski type close-to-convex functions associated with Ruscheweyh Derivative Operator

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2019
The aim of this paper is tointroduce a new subclasses of the Janowski type close-to-convex functionsdefined by Ruscheweyh derivative operator and obtain coefficient boundsbelonging to this class.
Öznur Özkan Kılıç
doaj   +1 more source

On a Class of Close-to-Convex Functions [PDF]

Proceedings of the American Mathematical Society, 1972
We look at functionsf(z) for which there correspond functions +(z) convex of order a such that Re{f'(z)lq'(z)}>fl. We examine the influence of the second coefficient of +(z) on this class. In particular, distortion, covering, and radius of convexity theorems are proved.
openaire   +1 more source

Some Reciprocal Classes of Close-to-Convex and Quasi-Convex Analytic Functions

Mathematics, 2019
The present paper comprises the study of certain functions which are analytic and defined in terms of reciprocal function. The reciprocal classes of close-to-convex functions and quasi-convex functions are defined and studied.
Shahid Mahmood, Janusz Sokół, Hari Mohan Srivastava, Sarfraz Nawaz Malik   +3 more
doaj   +1 more source

Some Properties of a Subclass Involving Close - to - Convex of Univalent and Multivalent Functions

Wasit Journal for Pure Sciences
Our work included studying some subclasses of functions (univalent - multivalent) that are close to convex. which is divide into two parts. First part, we discussed the properties of parameter estimates, the implication relation, distortion theorem, and
Nada Mohammed Abbas Abbas
doaj   +1 more source

Fractional Differential Operator Based on Quantum Calculus and Bi-Close-to-Convex Functions

Mathematics
In this article, we first consider the fractional q-differential operator and the λ,q-fractional differintegral operator Dqλ:A→A. Using the λ,q-fractional differintegral operator, we define two new subclasses of analytic functions: the subclass S*q,β,λ ...
Zeya Jia, Alina Alb Lupaş, Haifa Bin Jebreen, Georgia Irina Oros, Teodor Bulboacă, Qazi Zahoor Ahmad   +5 more
doaj   +1 more source

Clinical Validation of Plasma p‐217tau in Neurological Diseases

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Plasma p‐217tau is a minimally invasive but specific biomarker for diagnosing Alzheimer's disease (AD). However, its disease specificity remains to be clinically evaluated. We validated the reliability of the p‐217tau biomarker in 12 other neurological diseases.
Takeshi Kawarabayashi, Takumi Nakamura, Ryoma Takahashi, Tetsuya Ueda, Seiji Kinoshita, Chikage Uchida, Takashi Sugawara, Kentaro Hashimoto, Kunihiko Ishizawa, Masakuni Amari, Hiroo Kasahara, Yoshio Ikeda, Masamitsu Takatama, Mikio Shoji   +13 more
wiley   +1 more source

Some Evaluations About Coefficients Boundaries for Specific Classes of Bi-Univalent Functions

Axioms
New subclasses of bi-univalent functions with bounded boundary rotation are presented in this study. We acquired estimates for the initial coefficients a2, a3 and a4.
Suliman M. Sowileh, Gangadharan Murugusundaramoorthy, Borhen Halouani, Ibrahim S. Elshazly, Mohamed A. Mamon, Alaa H. El-Qadeem   +5 more
doaj   +1 more source

NEW CRITERIA FOR CLOSE-TO-CONVEXITY AND SPIRALLIKENESS

Journal of Applied Analysis & Computation, 2023
Summary: The aim of the present paper is to investigate several new criteria on a function to be strongly close-to-convexity, spirallikeness or starlikeness by using a new methodology.
Nunokawa, Mamoru, Kwon, Oh Sang, Sim, Young Jae, Cho, Nak Eun   +3 more
openaire   +2 more sources