VC-dimension and Erd艖s-Hajnal
VC-dimension and Erd艖s-Hajnal
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Alex Scott, Oxford University
A class of graphs has the Erd艖s-Hajnal property if there is some c>0 such that every graph G in the class has a clique or stable set of size at least |G|^c.听 Fox, Pach and Suk showed a few years ago that, for every d, the class of graphs with VC-dimension at most d has the "near Erd艖s-Hajnal property": namely, that there are cliques or stable sets of size exp((log |G|)^{1-o(1)}).听 We will show that in fact these classes have the full Erd艖s-Hajnal property.听 Joint work with Tung Nguyen and Paul Seymour.