A Class of <i>k</i>-Symmetric Harmonic Functions Involving a Certain <i>q</i>-Derivative Operator

In this paper, we introduce a new class of harmonic univalent functions with respect to <i>k</i>-symmetric points by using a newly-defined <i>q</i>-analog of the derivative operator for complex harmonic functions. For this harmonic univalent function class, we derive a suffic...

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Bibliographic Details
Main Authors: Hari M. Srivastava, Nazar Khan, Shahid Khan, Qazi Zahoor Ahmad, Bilal Khan
Format: Article
Language:English
Published: MDPI AG 2021-07-01
Series:Mathematics
Subjects:
Online Access:https://www.mdpi.com/2227-7390/9/15/1812
Description
Summary:In this paper, we introduce a new class of harmonic univalent functions with respect to <i>k</i>-symmetric points by using a newly-defined <i>q</i>-analog of the derivative operator for complex harmonic functions. For this harmonic univalent function class, we derive a sufficient condition, a representation theorem, and a distortion theorem. We also apply a generalized <i>q</i>-Bernardi–Libera–Livingston integral operator to examine the closure properties and coefficient bounds. Furthermore, we highlight some known consequences of our main results. In the concluding part of the article, we have finally reiterated the well-demonstrated fact that the results presented in this article can easily be rewritten as the so-called <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo stretchy="false">(</mo><mi>p</mi><mo>,</mo><mi>q</mi><mo stretchy="false">)</mo></mrow></semantics></math></inline-formula>-variations by making some straightforward simplifications, and it will be an inconsequential exercise, simply because the additional parameter <i>p</i> is obviously unnecessary.
ISSN:2227-7390