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arXiv math/0510071math.CV
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单值化定理的简单证明

Simple proofs of uniformization theorems

Alexey Glutsyuk

摘要:

Morrey证明的可测Riemann映射定理以及Ahlfors,Lavrentiev和Vekua在某些特殊情况下证明的可测Riemann映射定理表明,$\rd$上的任何可测几乎复结构($S^2$)有界扩张是可积的:存在$\rd$的拟共形同胚($S^2$)到$\cc$上($\bc$)将给定的殆复结构转化为标准结构。我们给出了这个定理的一个初等证明,证明过程如下。首先证明了它的双周期形式:两个环面上的每个$\ci$殆复结构都可以通过一个同构变换到相应复环面上的标准复结构.证明是基于带参数的$\td$上Beltrami方程的同伦方法。(As一个副产品,我们提出了庞加莱-柯比定理的一个简单证明,即每个单连通黎曼曲面共形等价于$\bar{\cc}$,或$\cc$,或单位圆盘。)然后,一般情况下处理的$\ci$双周期逼近和简单的正规性参数(包括Grötzsch不等式)的经典计划。

英文摘要:

The measurable Riemann mapping theorem proved by Morrey and in some particular cases by Ahlfors, Lavrentiev and Vekua, says that any measurable almost complex structure on $\rd$ ($S^2$) with bounded dilatation is integrable: there is a quasiconformal homeomorphism of $\rd$ ($S^2$) onto $\cc$ ($\bc$) transforming the given almost complex structure to the standard one. We give an elementary proof of this theorem that is done as follows. Firstly we prove its double-periodic version: each $\ci$ almost complex structures on the two-torus can be transformed by a diffeomorphism to the standard complex structure on appropriate complex torus. The proof is based on the homotopy method for the Beltrami equation on $\td$ with parameter. (As a by-product, we present a simple proof of the Poincaré-Köbe theorem saying that each simply-connected Riemann surface is conformally equivalent to either $\bar{\cc}$, or $\cc$, or the unit disc.) Afterwards the general case is treated by $\ci$ double-periodic approximation and simple normality arguments (involving Grötzsch inequality) following the classical scheme.

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