arXiv:2611.12468 · v1

Sets of reach $R$ are $\operatorname{CAT}\left( 1/R^2\right)$

首次提交 2026-11-09 22:16

版本更新 2026-11-09 22:16

雷达观测 2026-11-10 15:22

摘要

Positive reach underpins many results in computational geometry and topology. It is used for triangulation criteria, topological inference, and manifold learning. The geometric properties of these sets have therefore been studied intensely. In this paper we focus on the intrinsic metric properties of sets of positive reach. In particular we give an elementary proof of the fact that (closed) sets of reach at least $R$ are $\operatorname{CAT}(1/R^2)$. This fact was established earlier by Alexander and Bishop, using quite significant machinery. The fact that a space is $\operatorname{CAT}(1/R^2)$ offers many advantages, such as the uniqueness and continuity of sufficiently short geodesics, the existence of Fr{é}chet means and by extension the Rips based homotopy reconstruction of Hausmann is available.