Results 31 to 40 of about 269,754 (160)

Fourth-Order Hankel Determinants and Toeplitz Determinants for Convex Functions Connected with Sine Functions

Journal of Mathematics, 2022
This article deals with the upper bound of fourth-order Hankel and Toeplitz determinants for the convex functions which are defined by using the sine function.
Farah Zulfiqar, Sarfraz Nawaz Malik, Mohsan Raza, Md. Shajib Ali   +3 more
doaj   +1 more source

An exact estimate of the third Hankel determinants for functions inverse to convex functions

Математичні Студії, 2023
Invesigation of bounds for Hankel determinat of analytic univalent functions is prominent intrest of many researcher from early twenth century to study geometric properties.
B. Rath, K. S. Kumar, D. V. Krishna
doaj   +1 more source

Upper Bound of Second Hankel Determinant for Certain Subclasses of Analytic Functions

Abstract and Applied Analysis, 2014
In this present investigation, we first give a survey of the work done so far in this area of Hankel determinant for univalent functions. Then the upper bounds of the second Hankel determinant |a2a4−a32| for functions belonging to the subclasses S(α,β),
Ming-Sheng Liu, Jun-Feng Xu, Ming Yang
doaj   +1 more source

Universally prestarlike functions associated with shell like domain

Математичні Студії, 2022
In this paper, we introduce universally prestarlike generalized functions of order $\vartheta $ with $\vartheta \leq 1$ associated with shell like domain, and we get coefficient bounds and the second Hankel determinant $|a_{2}a_{4}-a_{3}^{2}|$ for such ...
K. Vijaya, G. Murugusundaramoorthy, S. Yalçın   +2 more
doaj   +1 more source

On the Upper Bound of the Third Hankel Determinant for Certain Class of Analytic Functions Related with Exponential Function

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2022
In the present paper we introduce a new class of analytic functions f in the open unit disk normalized by f(0) = f′(0)−1 = 0, associated with exponential functions.
Breaz Daniel, Cătaş Adriana, Cotîrlă Luminiţa-Ioana   +2 more
doaj   +1 more source

Bound Associated with Certain Hankel Determinants and Zalcman Conjecture for Multivalent Functions of Bounded Turning [PDF]

Sahand Communications in Mathematical Analysis
In this paper, we investigate for a sharp upper bound to certain generalized second Hankel determinant, the Zalcman conjecture and an upper bound for the third, fourth Hankel determinants for the class of multivalent analytic bounded turning functions ...
Deekonda Vamshee Krishna, Nallamothu Vani, Biswajit Rath, Karri Sanjay Kumar   +3 more
doaj   +1 more source

Second Hankel determinant for certain subclasses ofbi-univalent functions [PDF]

, 2017
In the present paper, we obtain the upper bounds for the second Hankel determinant for certain subclasses of analytic and bi-univalent functions.
Çağlar, Murat, Deniz, Erhan, Srivastava, H.M., Erhan DENİZ, Hari Mohan SRIVASTAVA, SRIVASTAVA, HARI MOHAN, Murat ÇAĞLAR   +6 more
core   +1 more source

Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective

Advanced Electronic Materials, EarlyView.
Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe, Ivan Iudice, Giuseppe Castaldi, Marco Di Renzo, Vincenzo Galdi   +4 more
wiley   +1 more source

Improved upper bound of third order Hankel determinant for Ozaki close-to-convex functions [PDF]

, 2022
In this paper we improve the upper bound of the third order Hankel determinant for the class of Ozaki close-to-convex functions.
Milutin Obradović, Nikola Tuneski, Obradović, Milutin, Tuneski, Nikola   +3 more
core   +1 more source

Hankel operators that commute with second order differential operators. [PDF]

, 2008
Suppose that $\Gamma$ is a continuous and self-adjoint Hankel operator on $L^2(0, \infty )$ with kernel $\phi (x+y)$ and that $Lf=-(d/dx)(a(x)df/dx)+b(x)f(x) with $a(0)=0$.
Blower, Gordon
core   +4 more sources