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Roots of Ehrhart polynomials of Gorenstein Fano polytopes

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arxiv 1001.4165 v1 pith:7I54RKGH submitted 2010-01-23 math.CO

Roots of Ehrhart polynomials of Gorenstein Fano polytopes

classification math.CO
keywords rootspossessesrealehrhartexactlyfanogorensteinimaginary
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Given arbitrary integers $k$ and $d$ with $0 \leq 2k \leq d$, we construct a Gorenstein Fano polytope $\Pc \subset \RR^d$ of dimension $d$ such that (i) its Ehrhart polynomial $i(\Pc, n)$ possesses $d$ distinct roots; (ii) $i(\Pc, n)$ possesses exactly $2k$ imaginary roots; (iii) $i(\Pc, n)$ possesses exactly $d - 2k$ real roots; (iv) the real part of each of the imaginary roots is equal to $- 1 / 2$; (v) all of the real roots belong to the open interval $(-1, 0)$.

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