English

Bohr radius for certain close-to-convex harmonic mappings

Complex Variables 2020-12-15 v1

Abstract

Let H \mathcal{H} be the class of harmonic functions f=h+gˉ f=h+\bar{g} in the unit disk D:={zC:z<1}\mathbb{D}:=\{z\in\mathbb{C} : |z|<1\}, where h h and g g are analytic in D \mathbb{D} . Let PH0(α)={f=h+gH:(h(z)α)>g(z)  \mboxwith  0α<1,  g(0)=0,  zD}\mathcal{P}_{\mathcal{H}}^{0}(\alpha)=\{f=h+\overline{g} \in \mathcal{H} : \real (h^{\prime}(z)-\alpha)>|g^{\prime}(z)|\; \mbox{with}\; 0\leq\alpha<1,\; g^{\prime}(0)=0,\; z \in \mathbb{D}\} be the class of close-to-convex mappings defined by Li and Ponnusamy \cite{Injectivity section}. In this paper, we obtain the sharp Bohr-Rogosinski radius, improved Bohr radius and refined Bohr radius for the class PH0(α) \mathcal{P}_{\mathcal{H}}^{0}(\alpha) .

Keywords

Cite

@article{arxiv.2012.06829,
  title  = {Bohr radius for certain close-to-convex harmonic mappings},
  author = {Molla Basir Ahamed and Vasudevarao Allu and Himadri Halder},
  journal= {arXiv preprint arXiv:2012.06829},
  year   = {2020}
}

Comments

26 pages, 21 figures

R2 v1 2026-06-23T20:55:19.793Z