Convex normality of rational polytopes with long edges

Details Convex normality of rational polytopes with long edges Convex normality of rational polytopes with long edges

2009-12-07

arxiv.org/abs/0912.1068v2

Mathematics

Combinatorics

16 pages, final version, to appear in Advances in Mathematics

Scientific paper

We introduce the property of convex normality of rational polytopes and give a dimensionally uniform lower bound for the edge lattice lengths, guaranteeing the property. As an application, we show that if every edge of a lattice d-polytope P has lattice length at least 4d(d+1) then P is normal. This answers in the positive a question raised in 2007. If P is a lattice simplex whose edges have lattice lengths at least d(d+1) then P is even covered by lattice parallelepipeds. For the approach developed here, it is necessary to involve rational polytopes even for applications to lattice polytopes.

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