English

Geometric properties of certain integral operators involving Hornich operations

Complex Variables 2022-07-15 v2

Abstract

In this article, we investigate some standard geometric properties of the integral operators Jα[f](z)=0z(f(w)w)αdw,αC and z<1, J_\alpha [f](z)= \int_{0}^{z}\bigg(\frac{f(w)}{w}\bigg)^\alpha dw, \,\,\, \alpha \in \mathbb{C} \text{ and } |z|<1, and Iβ[g](z)=0z(g(w))βdw,βC and z<1, I_\beta [g](z)= \int_{0}^{z}\big(g'(w)\big)^\beta dw, \,\,\, \beta \in \mathbb{C} \text{ and } |z|<1, where ff and gg are elements of certain classical families of normalized analytic functions defined on the unit disk. In particular, preserving properties of the Hornich sum of the operators JαJ_\alpha and IβI_\beta will be studied. Moreover, we also present sharp pre-Schwarzian norm estimate of such integrals.

Keywords

Cite

@article{arxiv.2106.06495,
  title  = {Geometric properties of certain integral operators involving Hornich operations},
  author = {S. Kumar},
  journal= {arXiv preprint arXiv:2106.06495},
  year   = {2022}
}