Schwarzian derivative, integral means, and the affine and linear invariant families of biharmonic mappings

Schwarzian derivative, integral means, and the affine and linear invariant families of biharmonic mappings
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施瓦茨导数、积分均值以及双调和映射的仿射和线性不变量族

DOI:
10.1016/j.amc.2010.04.031
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发表时间:
2010-08
期刊:
Appl. Math. Comput.
影响因子:
--
通讯作者:
X. Wang
X. Wang
中科院分区:
其他
文献类型:
--
作者:
S. Ponnusamy, J. Qiao;X. Wang

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本文讨论了双调和映射的Schwarzian导数、积分均值以及仿射族和线性不变族的性质。首先,引入双调和映射F=∣z∣2G+H的Schwarzian导数S(F),得到S(F)是解析的几个充分必要条件。其次,引入了双调和映射的隶属性,得到了从属双调和映射的积分均值不等式。最后,我们引入了双调和映射的仿射和线性不变族,并证明了与这些不变族中函数的雅可比矩阵有关的几个估计。
In this paper we discuss the properties of the Schwarzian derivative, integral means and the affine and linear invariant families of biharmonic mappings. First, we introduce the Schwarzian derivative S(F) for biharmonic mappings F=∣z∣2G+H, and obtain several necessary and sufficient conditions for S(F) to be analytic. Second, we introduce the subordination of biharmonic mappings and obtain inequalities for integral means of subordinate biharmonic mappings. Finally, we introduce the affine and linear invariant families of biharmonic mappings and prove several estimates related to the Jacobian of functions in these invariant families.
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