Abstract

In this paper, we introduce and study a subclass of harmonic univalent functions defined by a differential operator in the unit disk U = {z ∈ C: |z| = 1}. Also we obtain the coefficient bounds, extreme points, convex combination and convolution conditions.

Highlights

  • In this paper we find that many results of Özturk and Yalcin [5] are incorrect

  • Results concerning the convolutions of functions satisfying the above inequalities with univalent, harmonic and convex functions in the unit disc and harmonic functions having positive real part are obtained

  • Let U denote the open unit disc and SH denote the class of all complex valued, harmonic, orientation-preserving, univalent functions f in U normalized by f (0) = fz(0) − 1 = 0

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Summary

ON A SUBCLASS OF HARMONIC UNIVALENT FUNCTIONS

Received: Accepted: Communicated by: 2000 AMS Sub. Class.: Key words: Abstract: 04 June, 2008 27 September, 2008 H.M. Srivastava 30C45, 31A05. The class of univalent harmonic functions on the unit disc satisfying the condition. Sharp coefficient relations and distortion theorems are given for these functions. In this paper we find that many results of Özturk and Yalcin [5] are incorrect. Some of the results of this paper correct the theorems and examples of [5]. Sharp coefficient relations and distortion theorems are given. Results concerning the convolutions of functions satisfying the above inequalities with univalent, harmonic and convex functions in the unit disc and harmonic functions having positive real part are obtained. Harmonic Univalent Functions K.K. Dixit and Saurabh Porwal vol 10, iss.

Introduction
Main Results
It is well known that the sharp inequality
Then f

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