On the integer points in a lattice polytope: n-fold Minkowski sum and boundary

Details On the integer points in a lattice polytope: n-fold Minkowski sum and boundary On the integer points in a lattice polytope: n-fold Minkowski sum and boundary

2010-06-10

arxiv.org/abs/1006.2053v1

Mathematics

Metric Geometry

Scientific paper

In this article we compare the set of integer points in the homothetic copy $n\Pi$ of a lattice polytope $\Pi\subseteq\R^d$ with the set of all sums $x_1+\cdots+x_n$ with $x_1,...,x_n\in \Pi\cap\Z^d$ and $n\in\N$. We give conditions on the polytope $\Pi$ under which these two sets coincide and we discuss two notions of boundary for subsets of $\Z^d$ or, more generally, subsets of a finitely generated discrete group.

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