The chromatic gap and its extremes

Details The chromatic gap and its extremes The chromatic gap and its extremes

2011-08-17

arxiv.org/abs/1108.3444v1

Mathematics

Combinatorics

41 pages; Cahiers Leibniz No 184, https://consult-cahiersleibniz.g-scop.grenoble-inp.fr/apps/WebObjects/CahiersLeibniz/

Scientific paper

The {\em chromatic gap} is the difference between the chromatic number and the clique number of a graph. Here we investigate $\gap(n)$, the maximum chromatic gap over graphs on $n$ vertices. Can the extremal graphs be explored? While computational problems related to the chromatic gap are hopeless, an interplay between Ramsey theory and matching theory leads to a simple and (almost) exact formula for $\gap(n)$ in terms of Ramsey numbers.

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