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arXiv 1306.0565math.AP
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具有相同零点的调和函数的梯度估计

A gradient estimate for harmonic functions sharing the same zeros

Dan Mangoubi

摘要:

设u,v是半径为2的圆上的两个调和函数,它们具有完全相同的零点集Z。我们观察到\log的梯度|u/v|在单位圆盘内,由一个只依赖于Z的常数所限定。在Z为空的情况下,这回到了李-丘对正调和函数的梯度估计。广义边界Harnack原理给出了\log上的Hölder估计|u/v|.

英文摘要:

Let u, v be two harmonic functions in the disk of radius two which have exactly the same set Z of zeros. We observe that the gradient of \log |u/v| is bounded in the unit disk by a constant which depends on Z only. In case Z is empty this goes back to Li-Yau's gradient estimate for positive harmonic functions. The general boundary Harnack principle gives Hölder estimates on \log |u/v|.

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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