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arXiv · 1204.6142

Lattice points in vector-dilated polytopes

Martin Henk·Eva Linke
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Abstract

For $A\in\mathbb{Z}^{m\times n}$ we investigate the behaviour of the number of lattice points in $P_A(b)=\{x\in\mathbb{R}^n:Ax\leq b\}$, depending on the varying vector $b$. It is known that this number, restricted to a cone of constant combinatorial type of $P_A(b)$, is a quasi-polynomial function if b is an integral vector. We extend this result to rational vectors $b$ and show that the coefficients themselves are piecewise-defined polynomials. To this end, we use a theorem of McMullen on lattice points in Minkowski-sums of rational dilates of rational polytopes and take a closer look at the coefficients appearing there.

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Martin Henk, Eva Linke. 2012-04-27. Lattice points in vector-dilated polytopes. https://arxiv.org/abs/1204.6142

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