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arXiv 1908.08759math.CV
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平面上调和映射下原像的个数和位置

Number and location of pre-images under harmonic mappings in the plane

Olivier Sète, Jan Zur

摘要:

利用辐角原理,导出了非退化调和映射$f$下原像个数的计算公式.这个公式揭示了原像和焦散之间的联系。我们的研究结果允许推导下的$f$几何的每一个非焦散点的原图像的数量。我们近似地定位焦散线附近点的原像。此外,我们应用我们的结果证明,对于每一个$k = n, n+1, \ldots, n^2$有一个调和多项式的次数$n$与$k$零。

英文摘要:

We derive a formula for the number of pre-images under a non-degenerate harmonic mapping $f$, using the argument principle. This formula reveals a connection between the pre-images and the caustics. Our results allow to deduce the number of pre-images under $f$ geometrically for every non-caustic point. We approximately locate the pre-images of points near the caustics. Moreover, we apply our results to prove that for every $k = n, n+1, \ldots, n^2$ there exists a harmonic polynomial of degree $n$ with $k$ zeros.

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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