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Beurling-Ahlfors扩张的伸张函数与ID-同胚
引用本文:郑学良. Beurling-Ahlfors扩张的伸张函数与ID-同胚[J]. 数学学报, 2002, 45(5): 1035-104. DOI: cnki:ISSN:0583-1431.0.2002-05-026
作者姓名:郑学良
作者单位:台州学院数学系,浙江,临海,317000;上海交通大学应用数学系,上海,200030
基金项目:国家自然科学基金(19531060),浙江省教育厅自然科学基金(20010154),台州学院自然科学基金资助项目
摘    要:本文研究实轴上同胚在上半平面的扩张.利用拟对称函数ρ对伸张函数D作了较精细的估计.同时借助于诱导的边界函数对D、ρ在边界附近的性质作了进一步刻划.作为应用,我们分别给出上半平面存在ID-同胚扩张和IID-同胚扩张的充分条件.

关 键 词:Beurling-Ahlfors扩张  拟对称函数  伸张函数  边界函数  ID-同胚
文章编号:0583-1431(2002)05-1035-06
修稿时间:2001-06-29

Dilatation Function of Beurling-Ahlfors Extension and ID-Homeomorphism
Xue Liang ZHENG. Dilatation Function of Beurling-Ahlfors Extension and ID-Homeomorphism[J]. Acta Mathematica Sinica, 2002, 45(5): 1035-104. DOI: cnki:ISSN:0583-1431.0.2002-05-026
Authors:Xue Liang ZHENG
Affiliation:Xue Liang ZHENG(Department of Applied Mathematics, Shanghai Jiaotong University, Shanghai 200030, P. R. China)(Department of Mathematics, Taizhou University, Linhai 317000, P. R. China)(E-mail: tzxyzxl@yahoo.com.cn)
Abstract:In this paper, we study the extensions on the upper half plane of the homeo-morphisms on the real axis.Using the quasisymmetric function, we get a relatively fine estimate of the dilatation function. In the meantime, we give a further characterization on D and p near the boundary by an induced boundary function. As applications, sufficient conditions of the existence of ID homeomorphism and IID homeomorphism are respectively presented.
Keywords:Beurling-Ahlfors Extension  Quasi-symmetric function  Dilatation function  Boundary function  ID-homeomorphism
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