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arXiv 2012.12857math.CAmath.MG
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关于Muckenhoupt权在度量空间中的扩张

On the extension of Muckenhoupt weights in metric spaces

Emma-Karoliina Kurki, Carlos Mudarra

摘要:

Wolff的一个定理指出定义在$\mathbb{R}^n$的可测子集上并满足Muckenhoupt型条件的权可以扩展到整个空间作为同类的Muckenhoupt权。我们将这个定理推广到支持加倍测度的度量测度空间中,给出了一个完备的、自包含的证明。相关的扩展问题,我们还显示了Muckenhoupt权重惠特尼链的度量设置的估计。

英文摘要:

A theorem by Wolff states that weights defined on a measurable subset of $\mathbb{R}^n$ and satisfying a Muckenhoupt-type condition can be extended into the whole space as Muckenhoupt weights of the same class. We give a complete and self-contained proof of this theorem generalized into metric measure spaces supporting a doubling measure. Related to the extension problem, we also show estimates for Muckenhoupt weights on Whitney chains in the metric setting.

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