Calderón–Zygmund kernels and rectifiability in the plane☆

Calderón–Zygmund kernels and rectifiability in the plane☆
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Calderón–Zygmund 核和平面可整流性☆

DOI:
10.1016/j.aim.2012.04.025
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发表时间:
2011
影响因子:
1.7
通讯作者:
X. Tolsa
X. Tolsa
中科院分区:
数学1区
文献类型:
--
作者:
V. Chousionis;J. Mateu;Laura Prat;X. Tolsa

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设E ∈ C是一个有限长的Borel集,即0<H1(E)<∞.利用大卫和Léger的一个定理,证明了与Cauchy核(甚至与它的一个坐标部分x/|z| 2年|z| 2,z=(x,y)∈C)蕴涵E是可求长的.我们将这个结果推广到任何形式为x2 n −1/|z| 2n,z=(x,y)∈C,n∈N.因此,我们提供了与柯西变换不直接相关的算子的第一个非平凡例子,其L2有界性意味着可求正性。
Let E⊂C be a Borel set with finite length, that is, 0<H1(E)<∞. By a theorem of David and Léger, the L2(H1⌊E)-boundedness of the singular integral associated to the Cauchy kernel (or even to one of its coordinate parts x/|z|2,y/|z|2,z=(x,y)∈C) implies that E is rectifiable. We extend this result to any kernel of the form x2n−1/|z|2n,z=(x,y)∈C,n∈N. We thus provide the first non-trivial examples of operators not directly related with the Cauchy transform whose L2-boundedness implies rectifiability.