On Promotion and Quasi-Tangled Labelings of Posets
On Promotion and Quasi-Tangled Labelings of Posets
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关于偏序集的提升和准缠结标签
DOI:
10.1007/s00026-023-00646-2
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发表时间:
2023
影响因子:
0.5
通讯作者:
Hodges, Eliot
中科院分区:
文献类型:
--
作者:
Hodges, Eliot
In 2022, Defant and Kravitz introduced extended promotion (denoted), a map that acts on the set of labelings of a poset. Extended promotion is a generalization of Schützenberger’s promotion operator, a well-studied map that permutes the set of linear extensions of a poset. It is known that ifLis a labeling of ann-element posetP, thenis a linear extension. This allows us to regardas a sorting operator on the set of all labelings ofP, where we think of the linear extensions ofPas the labelings which have been sorted. The labelings requiringapplications ofto be sorted are calledtangled; the labelings requiringapplications are calledquasi-tangled. We count the quasi-tangled labelings of a relatively large class of posets calledinflated rooted trees with deflated leaves. Given ann-element poset with a unique minimal element with the property that the minimal element has exactly one parent, it follows from the aforementioned enumeration that this poset hasquasi-tangled labelings. Using similar methods, we outline an algorithmic approach to enumerating the labelings requiringapplications to be sorted for any fixed. We also make partial progress towards proving a conjecture of Defant and Kravitz on the maximum possible number of tangled labelings of ann-element poset.
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