Combinatorial reciprocity for the chromatic polynomial and the chromatic symmetric function
Combinatorial reciprocity for the chromatic polynomial and the chromatic symmetric function
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DOI:
10.1016/j.disc.2020.111989
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发表时间:
2019-04
期刊:
影响因子:
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通讯作者:
O. Bernardi;Philippe Nadeau
中科院分区:
文献类型:
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作者:
O. Bernardi;Philippe Nadeau
Let G be a graph, and let χ G be its chromatic polynomial. For any non-negative integers i, j, we give an interpretation for the evaluation χ G (i)(− j) in terms of acyclic orientations. This recovers the classical interpretations due to Stanley and to Greene and Zaslavsky respectively in the cases i= 0 and j= 0. We also give symmetric function refinements of our interpretations, and some extensions. The proofs use heap theory in the spirit of a 1999 paper of Gessel.