A proof of the peak polynomial positivity conjecture
A proof of the peak polynomial positivity conjecture
复制标题
峰值多项式正性猜想的证明
DOI:
10.1016/j.jcta.2017.01.004
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Omar, Mohamed
中科院分区:
文献类型:
--
作者:
Diaz-Lopez, Alexander;Harris, Pamela E.;Insko, Erik;Omar, Mohamed
We say that a permutation π= π 1 π 2⋯ π n∈ S n has a peak at index i if π i− 1< π i> π i+ 1. Let P (π) denote the set of indices where π has a peak. Given a set S of positive integers, we define P (S; n)={π∈ S n: P (π)= S}. In 2013 Billey, Burdzy, and Sagan showed that for subsets of positive integers S and sufficiently large n,| P (S; n)|= p S (n) 2 n−| S|− 1 where p S (x) is a polynomial depending on S. They proved this by establishing a recursive formula for p S (x) involving an alternating sum, and they conjectured that the coefficients of p S (x) expanded in a binomial coefficient basis centered at max(S) are all nonnegative. In this paper we introduce a new recursive formula for| P (S; n)| without alternating sums and we use this recursion to prove that their conjecture is true.
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发表时间:
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期刊:
arXiv: Combinatorics
影响因子:
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期刊:
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