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arXiv 2005.09785math.FA
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群上Lipschitz自由空间的逼近性质

Approximation properties in Lipschitz-free spaces over groups

Michal Doucha, Pedro Levit Kaufmann

摘要:

本文研究了紧致一致离散度量空间上的Lipschitz-free空间,该空间具有某些高正则性的性质,即具有左不变度量的群结构。利用调和分析的方法,我们证明了,给定一个紧致可度量化群$G$,它具有任意相容的左不变度量$d$,$G$上的Lipschitz自由空间$\mathcal{F}(G,d)$满足度量逼近性质.我们还证明了,给定一个从一类允许某种特殊类型的组合的群中有限生成群$G$,其字度量为$d$,其中包括所有的双曲群和大类型的Artin群,$\mathcal{F}(G,d)$具有Schauder基。实例和应用进行了讨论。特别地,对于实双曲$n$ -空间$\mathbb{H}^n$中的任何净$N$,$\mathcal{F}(N)$具有Schauder基。

英文摘要:

We study Lipschitz-free spaces over compact and uniformly discrete metric spaces enjoying certain high regularity properties - having group structure with left-invariant metric. Using methods of harmonic analysis we show that, given a compact metrizable group $G$ equipped with an arbitrary compatible left-invariant metric $d$, the Lipschitz-free space over $G$, $\mathcal{F}(G,d)$, satisfies the metric approximation property. We show also that, given a finitely generated group $G$, with its word metric $d$, from a class of groups admitting a certain special type of combing, which includes all hyperbolic groups and Artin groups of large type, $\mathcal{F}(G,d)$ has a Schauder basis. Examples and applications are discussed. In particular, for any net $N$ in a real hyperbolic $n$-space $\mathbb{H}^n$, $\mathcal{F}(N)$ has a Schauder basis.

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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