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arXiv 2201.06122math.CV
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单叶函数导数在Hardy空间中的积分平均

Integral means of derivatives of univalent functions in Hardy spaces

Fernando Pérez-González, Jouni Rättyä, Toni Vesikko

摘要:

证明了Hardy空间$H^p$中的范数对所有单叶函数满足\begin{equation}\label{absteq} \|f\|_{H^p}^p\asymp\int_0^1M_q^p(r,f')(1-r)^{p\left(1-\frac1q\right)}\,dr+|f(0)|^p\tag† \end{equation},只要$q\ge2$或$\frac{2p}{2+p}<q<2$ . Pommerenke(1962)、Baernstein、Girela和Peláez(2004)以及González和Peláez(2009)的结果在$0<p\le q<\infty$和$\frac{p}{1+p}<q<p<2+\frac{2}{157}$的情况下已知这种渐近性。本文还证明了对所有近于凸函数,若$1\le q<\infty$满足,则\eqref{absteq}是成立的.在加权Bergman空间的背景下,\eqref{absteq}的一个对应也作了简要的讨论。

英文摘要:

We show that the norm in the Hardy space $H^p$ satisfies \begin{equation}\label{absteq} \|f\|_{H^p}^p\asymp\int_0^1M_q^p(r,f')(1-r)^{p\left(1-\frac1q\right)}\,dr+|f(0)|^p\tag† \end{equation} for all univalent functions provided that either $q\ge2$ or $\frac{2p}{2+p}<q<2$. This asymptotic was previously known in the cases $0<p\le q<\infty$ and $\frac{p}{1+p}<q<p<2+\frac{2}{157}$ by results due to Pommerenke (1962), Baernstein, Girela and Peláez (2004) and González and Peláez (2009). It is also shown that \eqref{absteq} is satisfied for all close-to-convex functions if $1\le q<\infty$. A counterpart of \eqref{absteq} in the setting of weighted Bergman spaces is also briefly discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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