The Sperner property for 132‐avoiding intervals in the weak order
The Sperner property for 132‐avoiding intervals in the weak order
复制标题
132 的 Sperner 性质 — 避免弱序中的区间
DOI:
10.1112/blms.12433
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发表时间:
2020
影响因子:
0.9
通讯作者:
Tung, Katherine
中科院分区:
文献类型:
--
作者:
Gaetz, Christian;Tung, Katherine
A well‐known result of Stanley from 1980 implies that the weak order on a maximal parabolic quotient of the symmetric grouphas the Sperner property; this same property was recently established for the weak order on all ofby Gaetz and Gao, resolving a long‐open problem. In this paper, we interpolate between these results by showing that the weak order on any parabolic quotient of(and more generally on any 132‐avoiding interval) has the Sperner property.This result is proven by exhibiting an action ofrespecting the weak order on these intervals. As a corollary we obtain a new formula for principal specializations of Schubert polynomials. Our formula can be seen as a strong Bruhat order analogue of Macdonald's reduced word formula. This proof technique and formula generalize work of Hamaker–Pechenik–Speyer–Weigandt and Gaetz–Gao.
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DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
Christian Gaetz;Yibo Gao
通讯作者:
Yibo Gao
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
Robert A. Proctor
通讯作者:
Robert A. Proctor
DOI:
10.1016/j.jcta.2019.105178
发表时间:
2018
期刊:
J. Comb. Theory A
影响因子:
--
作者:
Christian Gaetz;Yibo Gao
通讯作者:
Yibo Gao
影响因子:
1
作者:
Christian Gaetz;Yibo Gao
通讯作者:
Yibo Gao
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
G. Merzon;E. Smirnov
通讯作者:
E. Smirnov