The cross-product conjecture for width two posets
The cross-product conjecture for width two posets
复制标题
宽度两个偏序集的叉积猜想
DOI:
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复制
发表时间:
2021
期刊:
影响因子:
--
通讯作者:
G. Panova
中科院分区:
文献类型:
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作者:
Swee Hong Chan;I. Pak;G. Panova
. The cross–product conjecture (CPC) of Brightwell, Felsner and Trotter (1995) is a two-parameter quadratic inequality for the number of linear extensions of a poset P = ( X, ≺ ) with given value differences on three distinct elements in X . We give two different proofs of this inequality for posets of width two. The first proof is algebraic and generalizes CPC to a four-parameter family. The sec- ond proof is combinatorial and extends CPC to a q -analogue. Further applications include relationships between CPC and other poset inequalities, and the equality part of the CPC for posets of width two.
DOI:
10.5070/c63160421
发表时间:
2023
期刊:
Combinatorial Theory
影响因子:
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作者:
Chan, Swee Hong;Pak, Igor;Panova, Greta
通讯作者:
Panova, Greta
影响因子:
1.1
作者:
Swee Hong Chan, Igor Pak
通讯作者:
Swee Hong Chan, Igor Pak