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In this paper, we determine the sharp estimates for Toeplitz determinants of a subclass of close-to-convex harmonic mappings. Moreover, we obtain an improved version of Bohr's inequalities for a subclass of close-to-convex harmonic…

Complex Variables · Mathematics 2021-12-21 Xiao-Yuan Wang , Zhi-Gang Wang , Jin-Hua Fan , Zhen-Yong Hu

Under binary matrices we mean matrices whose entries take one of two values. In this paper, explicit formulae for calculating the determinant of some type of binary Toeplitz matrices are obtained. Examples of the application of the…

Rings and Algebras · Mathematics 2017-02-21 Dmitry Efimov

Let $\mathcal{S}$ denote the class of analytic and univalent functions in $\mathbb{D}:=\{z\in\mathbb{C}:\, |z|<1\}$ of the form $f(z)= z+\sum_{n=2}^{\infty}a_n z^n$. In this paper, we determine sharp estimates for the Toeplitz determinants…

Complex Variables · Mathematics 2017-09-05 Md Firoz Ali , D. K. Thomas , A. Vasudevarao

A starlike function $f$ is characterized by the quantity $zf'(z)/f(z)$ lying in the right half-plane. This paper deals with sharp bounds for certain symmetric Toeplitz determinants whose entries are the coefficients of the functions $f$ for…

Complex Variables · Mathematics 2021-06-01 Om. P. Ahuja , Kanika Khatter , V. Ravichandran

Let ${\mathcal A}$ be the class of functions that are analytic in the unit disc ${\mathbb D}$, normalized such that $f(z)=z+\sum_{n=2}^\infty a_nz^n$, and let class ${\mathcal U}(\lambda)$, $0<\lambda\le1$, consists of functions…

Complex Variables · Mathematics 2021-11-22 Milutin Obradović , Nikola Tuneski

We determine sharp bounds on some Hankel determinants involving initial coefficients, inverse coefficients, and logarithmic inverse coefficients for two subclasses of Sakaguchi functions which are associated with the right half of the…

Complex Variables · Mathematics 2023-08-23 Sushil Kumar , Rakesh Kumar Pandey , Pratima Rai

The sharp bound for the third Hankel determinant for the coefficients of the inverse function of starlike function of order $1/2$ is obtained. In light of this, we can deduce that the functionals $|H_3(1)(f)|$ and $|H_3(1)(f^{-1})|$ exhibit…

Complex Variables · Mathematics 2023-07-07 Molla Basir Ahamed , Partha Pratim Roy

In this paper we determine the upper bounds of $|H_{2}(3)|$ for the inverse functions of functions of some classes of univalent functions, where $H_{2}(3)(f)=a_{3}a_{5}-a_{4}^{2}$ is the Hankel determinant of a special type.

Complex Variables · Mathematics 2022-11-23 Milutin Obradović , Nikola Tuneski

In this paper, we consider a general subclass of analytic and bi-univalent functions in the open unit disk in the complex plane. Making use of the Chebyshev polynomials, we obtain upper bound estimate for the second Hankel determinant for…

Complex Variables · Mathematics 2017-02-23 Nizami Mustafa

Focus in this paper is on the Hankel determinant, $H_3(1)$, for the well-known classes of bounded-turning, starlike and convex functions in the open unit disk $E=\{z\in \mathbb{C}\colon|z|<1\}$. The results obtained complete the series of…

Complex Variables · Mathematics 2009-10-21 K. O. Babalola

In this paper, we consider estimates of symmetric Toeplitz determinants $T_{q,n}(f)$ for the class ${\mathcal U}$ and for the general class ${\mathcal S}$ for certain values of $q$ and $n$ ($q,n=1,2,3\ldots$).

Complex Variables · Mathematics 2025-09-12 Milutin Obradović , Nikola Tuneski

In this paper we improve the bounds of the third order Hankel determinant for two classes of univalent functions with bounded turning. The bounds are not sharp, but the sharp ones are conjectured.

Complex Variables · Mathematics 2020-10-28 Milutin Obradović , Nikola Tuneski , Pawel Zaprawa

In this paper we improve the upper bound of the third order Hankel determinant for the class of Ozaki close-to-convex functions. The sharp bound is conjectured.

Complex Variables · Mathematics 2020-10-28 Milutin Obradović , Nikola Tuneski

In this paper we give the upper bounds of the Hankel determinants of the second and third order for the class $\mathcal{S}$ of univalent functions in the unit disc.

Complex Variables · Mathematics 2019-12-16 Milutin Obradović , Nikola Tuneski

We prove higher order asymptotic formulas for determinants and traces of finite block Toeplitz matrices generated by matrix functions belonging to generalized H\"older spaces with characteristic functions from the Bari-Stechkin class. We…

Functional Analysis · Mathematics 2007-05-23 Alexei Yu. Karlovich

In the present work, we propose to investigate the second Hankel determinant inequalities for certain class of analytic and bi-univalent functions. Some interesting applications of the results presented here are also discussed.

Complex Variables · Mathematics 2015-10-26 H. Orhan , N. Magesh , J. Yamini

In this paper, we obtain the sharp bounds of the second Hankel determinant of logarithmic inverse coefficients for the starlike and convex functions.

Complex Variables · Mathematics 2026-04-14 Vasudevarao Allu , Amal Shaji

In this paper, we consider the class of strongly bi-close-to-convex functions of order $\alpha$ and bi-close-to-convex functions of order $\beta$. We obtain an upper bound estimate for the second Hankel determinant for functions belonging…

Complex Variables · Mathematics 2021-03-30 S. Kanas , V. Sivasankari , O. Karthiyayini , S. Sivasubramanian

In this paper we determine the upper bounds of the Hankel determinants of special type $H_{2}(3)(f)$ and $H_{2}(4)(f)$ for the class of univalent functions and for the class $\mathcal{U}$ defined by \[ \mathcal{U}=\left\{ f\in\mathcal{A} :…

Complex Variables · Mathematics 2022-12-14 Milutin Obradović , Nikola Tuneski

Let $f$ be analytic in the unit disk $\mathbb{D}= \{z \in \mathbb{C}~:~ |z| < 1\}$, and $\mathcal{S}$ be the subclass of normalized univalent functions given by $f(z)=\sum_{n=1}^{\infty}a_{n}z^{n},~a_{1}:=1$ for $z \in\mathbb{D}$. We…

Complex Variables · Mathematics 2023-10-05 Biswajit Rath , K. Sanjay Kumar , D. Vamshee Krishna