Second Hankel determinant for a subclass of analytic bi-univalent functions defined by subordination

被引：10

作者：

Motamednezhad, Ahmad ^{[1
]}

Bulboaca, Teodor ^{[2
]}

Analouei Adegani, Ebrahim ^{[1
]}

Dibagar, Nesa ^{[1
]}

机构：

[1] Shahrood Univ Technol, Fac Math Sci, Shahrood, Iran

[2] Babes Bolyai Univ, Fac Math & Comp Sci, Cluj Napoca, Romania

来源：

TURKISH JOURNAL OF MATHEMATICS | 2018年 / 42卷 / 05期

关键词：

Bi-univalent functions; Fekete-Szego determinant; second Hankel determinant; differential subordination; Caratheodory functions; FEKETE-SZEGO PROBLEM; CONVEX-FUNCTIONS; STARLIKE; COEFFICIENTS;

D O I：

10.3906/mat-1710-106

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

In this work with a different technique we obtain upper bounds of the functional vertical bar a(2)a(4) - a(3)(2)vertical bar for functions belonging to a comprehensive subclass of analytic bi-univalent functions, which is defined by subordinations in the open unit disk. Moreover, our results extend and improve some of the previously known ones.

引用

页码：2798 / 2808

页数：11

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