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arXiv 2205.03093math.FAmath.MG
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Lipschitz算子的内射性

Injectivity of Lipschitz operators

Luis García-Lirola, Colin Petitjean, Antonin Prochazka

摘要:

度量空间之间的任何Lipschitz映射$f\colon M \to N$都可以被线性化,使得它成为$M$和$N$上的Lipschitz自由空间之间的有界线性算子$\widehat{f}\colon \mathcal F(M) \to \mathcal F(N)$。本文的目的是探讨$f$的内射性和$\widehat{f}$的内射性之间的联系。虽然很明显,如果$\widehat{f}$是单射的,那么$f$也是单射的,但相反的情况不太清楚。事实上,我们钉在某些情况下,这种含义不成立,但我们也证明,对于某些类的度量空间$M$,任何内射Lipschitz映射$f\colon M \to N$(任何$N$)承认一个内射线性化。在我们的研究过程中,我们研究了Lipschitz映射如何在自由空间中进行元素的支撑,并且我们还提供了$f$上更强的条件,以确保$\widehat{f}$是内射的。

英文摘要:

Any Lipschitz map $f\colon M \to N$ between metric spaces can be "linearised" in such a way that it becomes a bounded linear operator $\widehat{f}\colon \mathcal F(M) \to \mathcal F(N)$ between the Lipschitz-free spaces over $M$ and $N$. The purpose of this note is to explore the connections between the injectivity of $f$ and the injectivity of $\widehat{f}$. While it is obvious that if $\widehat{f}$ is injective then so is $f$, the converse is less clear. Indeed, we pin down some cases where this implication does not hold but we also prove that, for some classes of metric spaces $M$, any injective Lipschitz map $f\colon M \to N$ (for any $N$) admits an injective linearisation. Along our way, we study how Lipschitz maps carry the support of elements in free spaces and also we provide stronger conditions on $f$ which ensure that $\widehat{f}$ is injective.

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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