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arXiv · 2505.15421

On various Carleson-type geometric lemmas and uniform rectifiability in metric spaces: Part 2

Katrin Fässler·Ivan Yuri Violo
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Abstract

We characterize uniform $k$-rectifiability in Euclidean spaces in terms of a Carleson-type geometric lemma for a new notion of flatness coefficients, which we call $ι$-numbers. The characterization follows from an abstract statement about approximation by generalized planes in metric spaces, which also applies to the study of low-dimensional sets in Heisenberg groups. A key aspect is that the $ι$-coefficients are in general not pointwise comparable to the usual squared $β$-numbers for dyadic cubes on $k$-regular sets in $\mathbb{R}^n$, however our result implies that they are still equivalent in terms of a Carleson-type geometric lemma.

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Katrin Fässler, Ivan Yuri Violo. 2026-07-06. On various Carleson-type geometric lemmas and uniform rectifiability in metric spaces: Part 2. https://arxiv.org/abs/2505.15421

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