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Some refinements of the Fekete and Szegö inequalities in one and higher dimensions
Complex Variables and Elliptic Equations ( IF 0.6 ) Pub Date : 2020-03-23 , DOI: 10.1080/17476933.2020.1743985
Qinghua Xu 1 , Yuanping Lai 1 , Taishun Liu 2
Affiliation  

In this paper, we introduce a class of holomorphic functions Mg(U) on unit disk U. Let w(ξ) be a normalized holomorphic function on U such that w(ξ)/w(ξ)Mg(U), and w(ξ)ξ has a zero of order k + 1 at ξ=0. By using the formula of Faà di Bruno for the kth derivative of a composite function, we establish the Fekete and Szegö inequality for w(ξ), and then we extend this result to higher dimensions. The results presented here generalize some known results. Finally, a certain problem is also considered.



中文翻译:

一维和更高维上的Fekete和Szegö不等式的一些改进

在本文中,我们介绍了一类全纯函数 中号Gü 在单元盘上 ü。让wξ 是上的归一化全纯函数 ü 这样 wξ/wξ中号Gü, 和 wξ-ξ的零阶为k  +1ξ=0。通过使用Faàdi Bruno公式作为复合函数的k阶导数,我们建立了Fekete和Szegö不等式wξ,然后将结果扩展到更高的维度。这里介绍的结果概括了一些已知的结果。最后,还考虑了某个问题。

更新日期:2020-03-23
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