The chromatic number of comparability 3-hypergraphs

Natalia Garcia-Colin, Amanda Montejano, Deborah Oliveros

Published 2014-02-24Version 1

Beginning with the concepts of orientation for a 3-hypergraph and transitivity for an oriented 3-hypergraph, it is natural to study the class of comparability 3-hypergraphs (those that can be transitively oriented). In this work we show three different behaviors in respect to the relationship between the chromatic number and the clique number of a comparability 3-hypergraph, this is in contrast with the fact that a comparability simple graph is a perfect graph.