On power deformations of univalent functions
On power deformations of univalent functions
复制标题
关于单价函数的幂变形
DOI:
10.1007/s00605-011-0344-y
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
Y.C.Kim
中科院分区:
文献类型:
--
作者:
Hosokawa;M.;Yoneda;Y.;Shoji;H. & Ozaki;H.;H.Okamoto;N. Kawazumi;Toshio Oshima;中園智晶;Y.C.Kim
For an analytic functionf(z) on the unit disk |z| < 1 withf(0) =f′(0) − 1 = 0 andf(z) ≠ 0, 0 < |z| < 1, we consider the power deformationfc(z) =z(f(z)/z)cfor a complex numberc. We determine those valuescfor which the operatormaps a specified class of univalent functions into the class of univalent functions. A little surprisingly, we will see that the set is described by the variability region of the quantityzf′(z)/f(z), |z| < 1, for most of the classes that we consider in the present paper. As an unexpected by-product, we show boundedness of strongly spirallike functions.
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DOI:
10.1090/s0002-9939-1958-0095954-5
发表时间:
1958
期刊:
--
影响因子:
--
作者:
A. Schild
通讯作者:
A. Schild
DOI:
10.1090/s0002-9939-1953-0053221-5
发表时间:
1953
期刊:
--
影响因子:
--
作者:
A. Goodman
通讯作者:
A. Goodman
影响因子:
0.5
作者:
Cz. Bucka;K. Ciozda
通讯作者:
K. Ciozda
DOI:
--
发表时间:
2012
期刊:
Comput. Methods Func. Theory
影响因子:
--
作者:
Miyauchi;T.;T. Sugawa
通讯作者:
T. Sugawa
影响因子:
0.9
作者:
J. Pfaltzgraff
通讯作者:
J. Pfaltzgraff