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Derangements, Ehrhart Theory, and Local h-polynomials. (arXiv:1807.05246v1 [math.CO])
来源于:arXiv
The Eulerian polynomials and derangement polynomials are two well-studied
generating functions that frequently arise in combinatorics, algebra, and
geometry. When one makes an appearance, the other often does so as well, and
their corresponding generalizations are similarly linked. This is this case in
the theory of subdivisions of simplicial complexes, where the Eulerian
polynomial is an $h$-polynomial and the derangement polynomial is its local
$h$-polynomial. Separately, in Ehrhart theory the Eulerian polynomials are
generalized by the $h^\ast$-polynomials of $s$-lecture hall simplices. Here, we
show that derangement polynomials are analogously generalized by the box
polynomials, or local $h^\ast$-polynomials, of the $s$-lecture hall simplices,
and that these polynomials are all real-rooted. We then connect the two
theories by showing that the local $h$-polynomials of common subdivisions in
algebra and topology are realized as local $h^\ast$-polynomials of $s$-lecture
hall simplices 查看全文>>