Is there always an extremal teichmuller mapping?

被引:10
作者
Yao, GW [1 ]
机构
[1] Chinese Acad Sci, Acad Math & Syst Sci, Inst Math, Beijing 100080, Peoples R China
来源
JOURNAL D ANALYSE MATHEMATIQUE | 2004年 / 94卷 / 1期
关键词
D O I
10.1007/BF02789054
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Given a quasisymmetric self-homeomorphism h of the unit circle S-1, let Q(h) be the set of all quasiconformal mappings with the boundary correspondence h. In [1], it was shown that there exists h for which no extremal extension in Q(h) as a Teichmuller mapping is possible. This disproved some conjectures of long standing. In the example constructed there, the boundary correspondence has a single extremal quasiconformal extension. We show that even when there are infinitely many extremal extensions of the boundary values, it may still happen that none of the extensions is a Teichmuller mapping. An infinitesimal version of this result is also obtained.
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页码:363 / 375
页数:13
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