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Hypergraph coloring complexes

Authors: Felix Breuer; Aaron Dall; Martina Kubitzke;
APC: 2,257.53 EUR

Hypergraph coloring complexes

Abstract

The aim of this paper is to generalize the notion of the coloring complex of a graph to hypergraphs. We present three different interpretations of those complexes -- a purely combinatorial one and two geometric ones. It is shown, that most of the properties, which are known to be true for coloring complexes of graphs, break down in this more general setting, e.g., Cohen-Macaulayness and partitionabilty. Nevertheless, we are able to provide bounds for the $f$- and $h$-vectors of those complexes which yield new bounds on chromatic polynomials of hypergraphs. Moreover, it is shown that the coloring complex of a hypergraph has a wedge decomposition, though we conjecture that in general this decomposition is not homotopy equivalent to a wedge of spheres. In addition, we can completely characterize those hypergraphs whose coloring complex is connected.

2 figures, small changes and counterexample to a conjecture added

Keywords

Cohen-Macaulay modules, hypergraph, coloring complex, chromatic polynomial, Coloring complex, Hypergraphs, Cohen, Article, Macaulay, Theoretical Computer Science, Chromatic polynomial, Cohen–Macaulay, Coloring of graphs and hypergraphs, 05C65, 05C15, 05E45, 52B05, Ehrhart theory, Hypergraph, wedge lemma, FOS: Mathematics, Discrete Mathematics and Combinatorics, Mathematics - Combinatorics, Combinatorics (math.CO), Wedge lemma

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
Average
Average
Green
hybrid