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Douady-Earle延拓中用到的擬共形映照參數(shù)表示

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摘要: 假設(shè) fμ(z)(z)是單位圓D 到自身保持-1,i,1不動(dòng),具有復(fù)特征μ(z)的Douady-Earle延拓。借助于上半平面到自身保持0,1,∞三點(diǎn)不動(dòng)的擬共形映射的參數(shù)表示,利用單位圓到上半平面的共形映射,給出Douady-Earle延拓 fμ(z)(z)的參數(shù)表示。

關(guān)鍵詞: 擬共形映照; 參數(shù)表示; 復(fù)特征; Douady-Earle延拓

中圖分類(lèi)號(hào): O 174.55文獻(xiàn)標(biāo)志碼: A   文章編號(hào): 1000-5013(2024)06-0808-04

Parametric Representation of Douady-Earle Quasiconformal Extension

LIN Zhenlian

(School of Mathematical Sciences, Huaqiao University, Quanzhou 362021, China)

Abstract: Suppose fμ(z)(z) is a Douady-Earle extension of the unit disk D onto itself with the complex dilatation μ(z), which kept -1, i, 1 fixed. With the help of the parametric representation of the quasiconformal mapping of the upper half plane onto itself which kept 0, 1, ∞ fixed, by using the conformal mapping from the unit disk to the upper half plane, the parametric representation of the Douady-Early extension  fμ(z)(z) is given.

Keywords:

quasiconformal mapping; parametric representation; complex dilation; Douady-Earle extension

1 預(yù)備知識(shí)

設(shè)w=f(z)是平面區(qū)域E到區(qū)域G的C1類(lèi)保向同胚映照,且在E內(nèi)處處滿(mǎn)足條件

fz(z)<fz(z),Df(z)=fz(z)+fz(z)fz(z)-fz(z)≤K,  K≥1。(剩余5498字)

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