Symmetry of Narayana Numbers and Rowvacuation of Root Posets

Symmetry of Narayana Numbers and Rowvacuation of Root Posets
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Narayana数的对称性与根位姿的Rowvacuation

DOI:
10.1017/fms.2021.47
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发表时间:
2021
期刊:
Sigma
影响因子:
--
通讯作者:
Hopkins, Sam
Hopkins, Sam
中科院分区:
--
文献类型:
--
作者:
Defant, Colin;Hopkins, Sam

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For a Weyl group W of rank r, the W-Catalan number is the number of antichains of the poset of positive roots, and the W-Narayana numbers refine the W-Catalan number by keeping track of the cardinalities of these antichains. The W-Narayana numbers are symmetric – that is, the number of antichains of cardinality k is the same as the number of cardinality . However, this symmetry is far from obvious. Panyushev posed the problem of defining an involution on root poset antichains that exhibits the symmetry of the W-Narayana numbers.Rowmotion and rowvacuation are two related operators, defined as compositions of toggles, that give a dihedral action on the set of antichains of any ranked poset. Rowmotion acting on root posets has been the subject of a significant amount of research in the recent past. We prove that for the root posets of classical types, rowvacuation is Panyushev’s desired involution.
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