arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.10087math.CO
收藏

P-分拆生成函数间的正性

Positivity among P-partition generating functions

Nathan R. T. Lesnevich, Peter R. W. McNamara

AI总结:

研究标号偏序集对$(P,ω)$-分拆枚举数之差为$F$-正的条件,作为斜Schur函数正性问题的拟对称类比,给出了必要、充分及充要条件并证明组合运算保持正性。

摘要:

我们寻求一对标号偏序集的简单条件,以确定它们的$(P,ω)$-分拆枚举数之差何时是$F$-正的,即在Gessel的基础基中为正。这是一个拟对称的类比,对应于被广泛研究的问题:寻找一对斜形状的条件,以确定它们的斜Schur函数之差何时是Schur-正的。我们确定了$F$-正性的必要条件和独立的充分条件,并证明了一种组合偏序集的广泛运算能保持正性性质。最后,我们以若干类偏序集作为结论,对于这些偏序集我们得到了既必要又充分的条件。

英文摘要:

We seek simple conditions on a pair of labeled posets that determine when the difference of their $(P,ω)$-partition enumerators is $F$-positive, i.e., positive in Gessel's fundamental basis. This is a quasisymmetric analogue of the extensively studied problem of finding conditions on a pair of skew shapes that determine when the difference of their skew Schur functions is Schur-positive. We determine necessary conditions and separate sufficient conditions for $F$-positivity, and show that a broad operation for combining posets preserves positivity properties. We conclude with classes of posets for which we have conditions that are both necessary and sufficient.

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。

↑