Explicit quasiconformal extensions for some classes of univalent functions

Explicit quasiconformal extensions for some classes of univalent functions
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某些类单价函数的显式拟共形扩展

DOI:
10.1007/bf02568157
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发表时间:
1976
影响因子:
0.9
通讯作者:
Jadwiga Zygmunt
Jadwiga Zygmunt
中科院分区:
数学2区
文献类型:
--
作者:
M. Fait;J. Krzyż;Jadwiga Zygmunt

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我们说,如果fe S和f在整个平面(7)上有一个拟共形扩展,具有复扩张izf= f~/fz,且在(7)中几乎处处满足Ipc (z) l—< k,则fe Sk, 0—< k< 1。符号fz, f~表示f的形式导数。设S*(a), O-< a< 1,表示由a阶强星形函数组成的S的子类,参见[1],[5],即满足:zf'(z) 7r arg f-~-y- < a~, z~ a (1)
We say that fe Sk, 0--< k< 1, if fe S and f has a quasiconformal extension on the whole plane (7 with complex dilatation izf= f~/fz that satisfies Ipc (z) l--< k almost everywhere in (7. The symbols fz, f~ denote formal derivatives of f. Let S*(a), O-< a< 1, denote the subclass of S consisting of strongly starlike functions of order a, cf.[1],[5], ie of functions f that satisfy: zf'(z) 7r arg f-~-y---< a~, z~ A.(1)