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Sharp approximate Carathéodory theorem and application to...
[Submitted on 24 Jun 2026] · 2026-06-25 · via cs updates on arXiv.org

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Abstract:We analyze the decrease of simplex diameters under iterated refinement of spherical Delaunay complexes. Unlike in ordinary subdivision, the refined Delaunay complex need not be a subdivision of the previous one, so mesh contraction is not automatic. We derive explicit contraction bounds for several families of Steiner points, including Delaunay analogues of barycentric and edgewise subdivision. The proof reduces the problem to sharp covering estimates for Euclidean simplices. These estimates are obtained through a strengthening of Maurey's empirical method via pivotal sampling and a dimension-dependent version of the approximate Carathéodory theorem. Theoretical results and numerical experiments show that Delaunay refinements achieve stronger contraction than their subdivision counterparts.

Submission history

From: Raphaël Tinarrage [view email]
[v1] Wed, 24 Jun 2026 14:02:42 UTC (244 KB)