Remarks on a paper by Zeev Nehari

Remarks on a paper by Zeev Nehari
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Zeev Nehari 对论文的评论

DOI:
10.1090/s0002-9904-1949-09243-1
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发表时间:
1949
影响因子:
1.3
通讯作者:
E. Hille
E. Hille
中科院分区:
数学1区
文献类型:
--
作者:
E. Hille

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则f(z)是单价f或| z |< 1。本文的目的是证明2是(2)中的最佳可能常数,其意义如下:对每个C>2,存在函数f(z),使得f或\z\ < 1,我们有(i)f(z)是holoniorphic的,(ii)f(z)取值1的次数无限多,(iii)|{f(z),z)|^ C[\ -|z\ 2 ] ~ 2,其中f等于z的真实的值。这样的函数的一个显式示例由下式给出:
then f {z) is univalent f or \z\ < 1 . The object of the present note is to show that 2 is the best possible constant in (2) in the following sense: For every C>2 there exists a function f (z) such that f or \z\ < 1 we have (i) f(z) is holoniorphic, (ii) f{z) takes on the value one infinitely often, and (iii) | {f(z), z) | ^ C[\ — | z\ 2 ] ~ 2 with equality f or real values of z. An explicit example of such a function is given by