Area Integral Means of Analytic Functions in the Unit Disk

Area Integral Means of Analytic Functions in the Unit Disk
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DOI:
10.4153/cmb-2017-053-3
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发表时间:
2017-08
期刊:
Canadian Mathematical Bulletin
影响因子:
--
通讯作者:
Xiaohui Cui;Chunjie Wang;Kehe Zhu
Xiaohui Cui;Chunjie Wang;Kehe Zhu
中科院分区:
其他
文献类型:
--
作者:
Xiaohui Cui;Chunjie Wang;Kehe Zhu

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对于单位圆盘$\mathbb{D}$上的解析函数$f$,我们证明了$\Text{c}\,\Text{}\,\Text{}\!|\!\Text{z}\!|\!\\Text{}\,\Text{}\,\Text{r}$关于加权面积度量${\Left(1\,-\,|z{{|}^{2}}\right)^{\pha}}da\Left(z\right)$是$\Left(c,\,1\right)$上的$r$的对数凸函数,其中$-3\,\le\,\α\,\le\,0\,\text{and}\,\text{c}\,\in\,[\,0,\,1)$。此外,$\α$的范围$[-3,\,0]$是最好可能的。当$c\,=\,0$时,我们的论点也简化了我们在前文中得到的几个结果的证明。
Abstract For an analytic function $f$ on the unit disk $\mathbb{D}$ , we show that the ${{L}^{2}}$ integral mean of $f$ on $\text{c}\,\text{}\,\text{ }\!\!|\!\!\text{ z }\!\!|\!\!\text{ }\,\text{}\,\text{r}$ with respect to the weighted area measure ${{\left( 1\,-\,|z{{|}^{2}} \right)}^{\alpha }}dA\left( z \right)$ is a logarithmically convex function of $r$ on $\left( c,\,1 \right)$ , where $-3\,\le \,\alpha \,\le \,0\,\text{and}\,\text{c}\,\in \,[\,0,\,1)$ . Moreover, the range $[-3,\,0]$ for $\alpha $ is best possible. When $c\,=\,0$ , our arguments here also simplify the proof for several results we obtained in earlier papers.