Promotion of Kreweras words
Promotion of Kreweras words
复制标题
克鲁维拉斯词的推广
DOI:
10.1007/s00029-021-00714-6
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Rubey, Martin
中科院分区:
文献类型:
--
作者:
Hopkins, Sam;Rubey, Martin
Kreweras words are words consisting ofn’s,n’s, andn’s in which every prefix has at least as many’s as’s and at least as many’s as’s. Equivalently, a Kreweras word is a linear extension of the poset. Kreweras words were introduced in 1965 by Kreweras, who gave a remarkable product formula for their enumeration. Subsequently they became a fundamental example in the theory of lattice walks in the quarter plane. We study Schützenberger’s promotion operator on the set of Kreweras words. In particular, we show that 3napplications of promotion on a Kreweras word merely swaps the’s and’s. Doing so, we provide the first answer to a question of Stanley from 2009, asking for posets with ‘good’ behavior under promotion, other than the four families of shapes classified by Haiman in 1992. We also uncover a strikingly simple description of Kreweras words in terms of Kuperberg’s-webs, and Postnikov’s trip permutation associated with any plabic graph. In this description, Schützenberger’s promotion corresponds to rotation of the web.
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DOI:
10.1016/j.jcta.2009.03.017
发表时间:
2010
期刊:
J. Comb. Theory A
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
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期刊:
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影响因子:
--
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影响因子:
0.8
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DOI:
10.37236/4569
发表时间:
2009
期刊:
Electron. J. Comb.
影响因子:
--
作者:
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影响因子:
0.8
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