Normal polytopes and ellipsoids
Combinatorics
2021-10-01 v2 Number Theory
Abstract
We show that: (1) unimodular simplices in a lattice 3-polytope cover a neighborhood of the boundary of the polytope if and only if the polytope is very ample, (2) the convex hull of lattice points in every ellipsoid in R^3 has a unimodular cover, and (3) for every d at least 5, there are ellipsoids in R^d, such that the convex hulls of the lattice points in these ellipsoids are not even normal. Part (3) answers a question of Bruns, Michalek, and the author.
Cite
@article{arxiv.2012.11846,
title = {Normal polytopes and ellipsoids},
author = {Joseph Gubeladze},
journal= {arXiv preprint arXiv:2012.11846},
year = {2021}
}
Comments
Final version, to appear in Electronic journal of combinatorics