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arXiv 2112.00518math.CO
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栅栏偏序集的秩多项式是单峰的

Rank Polynomials of Fence Posets are Unimodal

Ezgi Kantarcı Oğuz, Mohan Ravichandran

AI总结:

通过引入圆形栅栏偏序集并证明其秩多项式的对称性与单峰性,本文证实了 Morier-Genoud 等人关于栅栏偏序集秩多项式单峰性的猜想,并将 rowmotion 的同均值结果推广至圆形情况。

摘要:

我们证明了 Morier-Genoud 和 Ovsienko 的猜想,即栅栏偏序集下理想的分配格的秩多项式是单峰的。我们通过引入一类相关的圆形栅栏偏序集,并证明了 McConville、Sagan 和 Smyth 提出的更强版本的猜想来实现这一点。我们证明了圆形栅栏偏序集的秩多项式是对称的,并猜想除某些特定情况外,单峰性均成立。我们还应用了 Elizalde、Plante、Roby 和 Sagan 关于栅栏上的 rowmotion 的最新工作,并表明他们的许多同均值结果对于圆形情况同样成立。

英文摘要:

We prove a conjecture of Morier-Genoud and Ovsienko that says that rank polynomials of the distributive lattices of lower ideals of fence posets are unimodal. We do this by introducing a related class of circular fence posets and proving a stronger version of the conjecture due to McConville, Sagan and Smyth. We show that the rank polynomials of circular fence posets are symmetric and conjecture that unimodality holds except in some particular cases. We also apply the recent work of Elizalde, Plante, Roby and Sagan on rowmotion on fences and show many of their homomesy results hold for the circular case as well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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