Maximal periods of (Ehrhart) quasi-polynomials
Maximal periods of (Ehrhart) quasi-polynomials
复制标题
(Ehrhart) 拟多项式的最大周期
DOI:
10.1016/j.jcta.2007.05.009
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Kevin M. Woods
中科院分区:
文献类型:
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作者:
M. Beck;Steven V. Sam;Kevin M. Woods
A quasi-polynomial is a function defined of the form q(k)=cd(k)kd+cd−1(k)kd−1+⋯+c0(k), where c0,c1,…,cdare periodic functions in k∈Z. Prominent examples of quasi-polynomials appear in Ehrhart's theory as integer-point counting functions for rational polytopes, and McMullen gives upper bounds for the periods of the cj(k) for Ehrhart quasi-polynomials. For generic polytopes, McMullen's bounds seem to be sharp, but sometimes smaller periods exist. We prove that the second leading coefficient of an Ehrhart quasi-polynomial always has maximal expected period and present a general theorem that yields maximal periods for the coefficients of certain quasi-polynomials. We present a construction for (Ehrhart) quasi-polynomials that exhibit maximal period behavior and use it to answer a question of Zaslavsky on convolutions of quasi-polynomials.