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In this paper, we give a new generalization of the Bohr inequality in refined form both for bounded analytic functions, and for sense-preserving harmonic functions with analytic part being bounded.

复变函数 · 数学 2021-04-15 Saminathan Ponnusamy , Ramakrishnan Vijayakumar

Let $ \mathcal{H}(\mathbb{D}) $ be the class of analytic functions in the unit disk $ \mathbb{D} : =\{z\in\mathbb{C} : |z|<1\} $. The classical Bohr's inequality states that if a power series $ f(z)=\sum_{n=0}^{\infty}a_nz^n $ converges in…

复变函数 · 数学 2020-12-14 Molla Basir Ahamed , Vasudevarao Allu , Himadri Halder

The primary objective of this paper is to establish several sharp results concerning the Bohr inequality, the refined Bohr inequality, and the improved Bohr inequality for the classes of analytic functions and harmonic mappings defined on…

复变函数 · 数学 2026-03-18 Vasudevarao Allu , Raju Biswas , Rajib Mandal

In this paper, we study some improved and refined versions of the classical Bohr inequality applicable to the class $\mathcal{B}$, which consists of self-analytic mappings defined on the unit disk $\mathbb{D}$. First, we improve the Bohr…

复变函数 · 数学 2024-02-27 Molla Basir Ahamed , Partha Pratim Roy

In this paper, we first obtain a refined version of the Bohr inequality of norm-type for holomorphic mappings with lacunary series on the polydisk in $\mathbb{C}^n$ under some restricted conditions. Next, we determine the refined version of…

复变函数 · 数学 2023-03-17 Sabir Ahammed , Molla Basir Ahamed

Bohr's classical theorem and its generalizations are now active areas of research and have been the source of investigations in numerous function spaces. In this article, we study a generalized Bohr's inequality for the class of bounded…

复变函数 · 数学 2022-05-04 Shankey Kumar

Based on improving the classical Bohr inequality, we get in this paper some refined versions for a quasi-subordination family of functions, one of which is key to build our results. By means of these investigations, for a family of harmonic…

复变函数 · 数学 2021-03-30 Gang Liu , Saminathan Ponnusamy

The primary objective of this paper is to establish several sharp versions of improved Bohr inequalities, refined Bohr inequalities, and Bohr-Rogosinski inequalities for the class of $K$-quasiconformal sense-preserving harmonic mappings…

复变函数 · 数学 2024-11-27 Vasudevarao Allu , Raju Biswas , Rajib Mandal

In this article, by combining appropriate refined Bohr's inequalities with some techniques concerning bounded analytic functions defined in the unit disk, we generalize and improve several Bohr type inequalities for such functions.

复变函数 · 数学 2020-06-17 Gang Liu , Zhihong Liu , Saminathan Ponnusamy

We investigate improved forms of the Bohr inequality, using the quantity $S_r/\pi$, for analytic selfmaps in class $\mathcal{B}$ of $\mathbb{D}$, where $S_r$ is the area measure of $\mathbb{D}_r$. We then generalize the inequality for…

复变函数 · 数学 2025-10-28 Molla Basir Ahamed , Partha Pratim Roy , Sujoy Majumder

We prove several improved versions of Bohr's inequality for the harmonic mappings of the form $f=h+\overline{g}$, where $h$ is bounded by 1 and $|g'(z)|\le|h'(z)|$. The improvements are obtained along the lines of an earlier work of Kayumov…

复变函数 · 数学 2017-09-27 Stavros Evdoridis , Saminathan Ponnusamy , Antti Rasila

In this paper, a significant improvement has been achieved in the classical Bohr's inequality for the class $ \mathcal{B} $ of analytic self maps defined on the unit disk $ \mathbb{D} $. More precisely, we generalize and improve several…

复变函数 · 数学 2023-12-27 Molla Basir Ahamed , Sabir Ahammed

In this article, we study Bohr-type inequalities involving a parameter or convex combinations for $K$-quasiconformal, sense-preserving harmonic mappings in $\mathbb{D}$, where the analytic part is subordinate to a convex function. Moreover,…

复变函数 · 数学 2025-09-11 Molla Basir Ahamed , Taimur Rahman

In this paper, we investigate the Bohr phenomenon for the class of analytic functions defined on the simply connected domain \begin{equation*} \Omega_{\gamma}=\bigg\{z\in\mathbb{C} :…

复变函数 · 数学 2026-04-15 Molla Basir Ahamed , Vasudevarao Allu , Himadri Halder

In this article, we study the Bohr type inequality for {C}es\'{a}ro operator and {B}ernardi integral operator acting on the space of analytic functions defined on a simply connected domain containing the unit disk $\mathbb{D}$.

复变函数 · 数学 2022-02-15 Vasudevarao Allu , Nirupam Ghosh

In this paper, first we give a new generalization of the Bohr's inequality for the class of bounded analytic functions $\mathcal{B'}$ and for the class of sense-preserving $K$-quasiconformal harmonic mappings of the form $f=h+\overline{g},$…

复变函数 · 数学 2021-04-14 Ramakrishnan Vijayakumar

In this article, we first establish a generalized Bohr inequality and examine its sharpness for a class of analytic functions $f$ in a simply connected domain $\Omega_\gamma,$ where $0\leq \gamma<1$ with a sequence $\{\varphi_n(r)…

复变函数 · 数学 2024-05-06 Sabir Ahammed , Molla Basir Ahamed , Partha Pratim Roy

The primary objective of this paper is to establish several sharp versions of improved Bohr inequality, refined Bohr-type inequality, and refined Bohr-Rogosinski inequality for the class of $K$-quasiconformal sense-preserving harmonic…

复变函数 · 数学 2026-04-14 Raju Biswas , Rajib Mandal

In this article, we analyze refined and improved versions of the classical Bohr inequality for the function class $\mathcal{B}$, which consists of analytic self-mappings defined on the unit disk $\mathbb{D}$. We improve the Bohr-Rogosinski…

复变函数 · 数学 2025-12-19 Molla Basir Aahmed , Partha Pratim Roy

In this article we prove Bohr inequalities for sense-preserving $K$-quasiconformal harmonic mappings defined in $\mathbb{D}$ and obtain the corresponding results for sense-preserving harmonic mappings by letting $K\to\infty$. One of the…

复变函数 · 数学 2021-01-12 Bappaditya Bhowmik , Nilanjan Das
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