Volume 2, Issue 2 (12-2021)                   MACO 2021, 2(2): 73-82 | Back to browse issues page


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Abstract:   (1075 Views)
The main purpose of this article is to introduce and investigate the subcategory $mathcal{H}_{Sigma}(n,beta;phi)$ of bi-univalent functions in the open unit disk $mathbb{U}$ related to subordination. Moreover,  estimates on coefficient $|a_n|$ for functions belong to this subcategory are given applying different technique. In addition,  smaller upper bound and more accurate estimation than the previous outcomes are obtained.
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Type of Study: Research Article | Subject: Mathematical Analysis
Published: 2021/12/31

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