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arXiv 1306.2400math.CO
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(3+1)-free偏序集的色对称函数的模关系

A modular relation for the chromatic symmetric functions of (3+1)-free posets

Mathieu Guay-Paquet

摘要:

本文考虑一种线性关系,它用偏序集的色对称函数来表示偏序集的Stanley色对称函数,我们称之为模律.通过在(3+1)-free偏序集的上下文中应用这一点,我们能够将Stanley和Stembridge的猜想,即所有(3+1)-free偏序集的色对称函数都是e-正的,简化为(3+1)-和-(2+2)-free偏序集的情况,也称为单位区间序。事实上,我们的约简可以进一步推广到更小的偏序集类,对于这些偏序集我们没有令人满意的刻画。我们还得到了所有3-自由偏序集都有e-正色对称函数的新证明。

英文摘要:

We consider a linear relation which expresses Stanley's chromatic symmetric function for a poset in terms of the chromatic symmetric functions of some closely related posets, which we call the modular law. By applying this in the context of (3+1)-free posets, we are able to reduce Stanley and Stembridge's conjecture that the chromatic symmetric functions of all (3+1)-free posets are e-positive to the case of (3+1)-and-(2+2)-free posets, also known as unit interval orders. In fact, our reduction can be pushed further to a much smaller class of posets, for which we have no satisfying characterization. We also obtain a new proof of the fact that all 3-free posets have e-positive chromatic symmetric functions.

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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