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arXiv 2007.12827math.CV
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调和映射和调和拟正则映射的偏导数的模估计

Norm estimates of the partial derivatives for harmonic mappings and harmonic quasiregular mappings

Jian-Feng Zhu

摘要:

设$p\geq1$,$w=P[F]$是单位圆盘$\mathbb{D}$的调和映射,满足$F$绝对连续和$\dot{F}\in L^p(0, 2π)$,其中$\dot{F}(e^{it})=\frac{\mathrm{d}}{\mathrm{d}t}F(e^{it})$ .本文得到了$w$的偏导数的Bergman模估计,即,$\|w_z\|_{L^p}$和$\|\overline{w_{\bar{z}}}\|_{L^p}$,其中$1\leq p<2$ .进一步,如果$w$是$\mathbb{D}$的调和拟正则映射,则证明了$w_z$和$\overline{w_{\bar{z}}}$在Hardy空间$H^p$中,其中$1\leq p\leq\infty$ .得到了相应的Hardy模估计$\|w_z\|_{p}$和$\|\overline{w_{\bar{z}}}\|_{p}$.

英文摘要:

Suppose $p\geq1$, $w=P[F]$ is a harmonic mapping of the unit disk $\mathbb{D}$ satisfying $F$ is absolutely continuous and $\dot{F}\in L^p(0, 2π)$, where $\dot{F}(e^{it})=\frac{\mathrm{d}}{\mathrm{d}t}F(e^{it})$. In this paper, we obtain Bergman norm estimates of the partial derivatives for $w$, i.e., $\|w_z\|_{L^p}$ and $\|\overline{w_{\bar{z}}}\|_{L^p}$, where $1\leq p<2$. Furthermore, if $w$ is a harmonic quasiregular mapping of $\mathbb{D}$, then we show that $w_z$ and $\overline{w_{\bar{z}}}$ are in the Hardy space $H^p$, where $1\leq p\leq\infty$. The corresponding Hardy norm estimates, $\|w_z\|_{p}$ and $\|\overline{w_{\bar{z}}}\|_{p}$, are also obtained.

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