On the combinatorics of string polytopes

On the combinatorics of string polytopes
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弦多胞体的组合学

DOI:
10.1016/j.jcta.2021.105508
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发表时间:
2019
期刊:
J. Comb. Theory A
影响因子:
--
通讯作者:
Kyeong
Kyeong
中科院分区:
--
文献类型:
--
作者:
Yunhyung Cho;Yoosik Kim;Eunjeong Lee;Kyeong

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对于SL n+ 1(C)的Weyl群中最长元的约化字i,可以将其与参数化对偶标准基的弦锥Ci联系起来。在本文中,我们分类所有i的,使得C i是单纯的。我们还证明了对于sl n+ 1(C)的任何正则支配权λ,相应的弦多面体Δ i(λ)么模等价于与λ相关的Gelfand-Cetlin多面体当且仅当C i是单纯的。因此,我们完全刻画Gelfand-Cetlin型弦多面体的i。
For a reduced word i of the longest element in the Weyl group of SL n+ 1 (C), one can associate the string cone C i which parametrizes the dual canonical bases. In this paper, we classify all i's such that C i is simplicial. We also prove that for any regular dominant weight λ of sl n+ 1 (C), the corresponding string polytope Δ i (λ) is unimodularly equivalent to the Gelfand–Cetlin polytope associated to λ if and only if C i is simplicial. Thus we completely characterize Gelfand–Cetlin type string polytopes in terms of i.
DOI: --
发表时间: 2010
期刊:
影响因子: --
作者:
Tanisaki;T.
通讯作者: T.