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arXiv 0704.0621math.CVmath.AC
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柯西积分的唯一性定理

Uniqueness theorems for Cauchy integrals

Mark Melnikov, Alexei Poltoratski, Alexander Volberg

摘要:

如果$μ$是复平面$\C$中的有限复测度,我们用$C^μ$表示它在主值意义下的柯西积分。如果测度$μ$是连续的(没有原子),并且$C^μ=0$在$μ$ -几乎每个点都是。证明了如果$μ$是无反射的,且其柯西极大函数$C^μ_*$关于$|μ|$可和,则$μ$是平凡的.构造了一个极大函数属于“弱”$L^1$的无反射测度的例子,证明了上述结果在标度上是尖锐的.我们还给出了一个部分的几何描述的一组无反射措施的线,并讨论连接我们的结果与概念的有限周长的意义上的De Giorgi。

英文摘要:

If $μ$ is a finite complex measure in the complex plane $\C$ we denote by $C^μ$ its Cauchy integral defined in the sense of principal value. The measure $μ$ is called reflectionless if it is continuous (has no atoms) and $C^μ=0$ at $μ$-almost every point. We show that if $μ$ is reflectionless and its Cauchy maximal function $C^μ_*$ is summable with respect to $|μ|$ then $μ$ is trivial. An example of a reflectionless measure whose maximal function belongs to the "weak" $L^1$ is also constructed, proving that the above result is sharp in its scale. We also give a partial geometric description of the set of reflectionless measures on the line and discuss connections of our results with the notion of sets of finite perimeter in the sense of De Giorgi.

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