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arXiv · 1004.4194

Coarsening polyhedral complexes

Nathan Reading
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Abstract

Given a pure, full-dimensional, locally strongly connected polyhedral complex C with convex support, we characterize, by a local codimension-2 condition, polyhedral complexes that coarsen C. The proof of the characterization draws upon a surprising general shortcut for showing that a collection of polyhedra is a polyhedral complex and upon a property of hyperplane arrangements which is equivalent, for Coxeter arrangements, to Tits' solution to the Word Problem. The motivating special case, the case where C is a complete fan, generalizes a result of Morton, Pachter, Shiu, Sturmfels, and Wienand that equates convex rank tests with semigraphoids. The proof of the main result also implies a special case of Tietze's convexity theorem. We also prove oriented matroid versions of our results, obtaining, as a byproduct, an oriented matroid version of Tietze's convexity theorem.

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Nathan Reading. 2010-04-23. Coarsening polyhedral complexes. https://arxiv.org/abs/1004.4194

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