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arXiv 1808.03391math.CO
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具有e-正色对称函数的图类

Classes of graphs with e-positive chromatic symmetric function

Angèle M. Foley, Chính T. Hoàng, Owen D. Merkel

摘要:

在20世纪90年代中期,Stanley和Stembridge证明了无爪协可比(也称为不可比)图的色对称函数是e-正的。对这个猜想的证明的探索导致了对其他相关图类的研究。在2013年,Guay-Paquet证明了如果单位区间图是e-正的,这意味着无爪不可比图也是。受这种方法的启发,我们考虑了一个相关的情况,并证明了单位区间图的补也是一个单位区间图是e-正的。引入强$e$ -正的概念来表示图的诱导子图都是e-正的,并猜想图是强e-正的当且仅当它是(爪,网)-free的.

英文摘要:

In the mid-1990s, Stanley and Stembridge conjectured that the chromatic symmetric functions of claw-free co-comparability (also called incomparability) graphs were e-positive. The quest for the proof of this conjecture has led to an examination of other, related graph classes. In 2013 Guay-Paquet proved that if unit interval graphs are e-positive, that implies claw-free incomparability graphs are as well. Inspired by this approach, we consider a related case and prove that unit interval graphs whose complement is also a unit interval graph are e-positive. We introduce the concept of strongly $e$-positive to denote a graph whose induced subgraphs are all e-positive, and conjecture that a graph is strongly e-positive if and only if it is (claw, net)-free.

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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