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arXiv 1209.0202math.CV
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调和逼近凸函数与极小曲面

Harmonic Close-to-convex Functions and Minimal Surfaces

S. Ponnusamy, A. Rasila, A. Sairam Kaliraj

摘要:

本文利用$f_{\bar{z}}(0)=0$研究了开单位圆盘$\mathbb{D}$上的正则逼近凸函数的保义复值调和函数族${\mathcal C}_{H}^0$.我们得到了$f$属于类$\CC_{H}^0$的一个充分条件。我们把$f$的解析部分取为$zF(a,b;c;z)$或$zF(a,b;c;z^2)$,并且对于$f$的共解析部分的适当选择,第二复伸缩$w(z)=\bar{f_{\bar{z}}}/f_z$变成解析函数的平方。因此,$f$被提升到由等温参数表示的最小表面。给出了一类极小曲面的显式表示。使用Mathematica生成的图形用于说明。

英文摘要:

In this paper, we study the family ${\mathcal C}_{H}^0$ of sense-preserving complex-valued harmonic functions $f$ that are normalized close-to-convex functions on the open unit disk $\mathbb{D}$ with $f_{\bar{z}}(0)=0$. We derive a sufficient condition for $f$ to belong to the class $\CC_{H}^0$. We take the analytic part of $f$ to be $zF(a,b;c;z)$ or $zF(a,b;c;z^2)$ and for a suitable choice of co-analytic part of $f$, the second complex dilatation $w(z)=\bar{f_{\bar{z}}}/f_z$ turns out to be a square of an analytic function. Hence $f$ is lifted to a minimal surface expressed by an isothermal parameter. Explicit representation for classes of minimal surfaces are given. Graphs generated by using Mathematica are used for illustration.

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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