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Lattice multi-polygons

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arxiv 1204.0088 v4 pith:MGSRX7OB submitted 2012-03-31 math.CO math.ATmath.MG

Lattice multi-polygons

classification math.CO math.ATmath.MG
keywords latticemulti-polygonsformuladiscussgeneralizedmathbbpolygonscertain
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We discuss generalizations of some results on lattice polygons to certain piecewise linear loops which may have a self-intersection but have vertices in the lattice $\mathbb{Z}^2$. We first prove a formula on the rotation number of a unimodular sequence in $\mathbb{Z}^2$. This formula implies the generalized twelve-point theorem in [12]. We then introduce the notion of lattice multi-polygons which is a generalization of lattice polygons, state the generalized Pick's formula and discuss the classification of Ehrhart polynomials of lattice multi-polygons and also of several natural subfamilies of lattice multi-polygons.

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