Hypergraph regularity and the multidimensional Szemerédi theorem

Abstract

We prove analogues for hypergraphs of Szemerdi's regularity lemma and the associated counting lemma for graphs. As an application, we give the first combinatorial proof of the multidimensional Szemerdi theorem of Furstenberg and Katznelson, and the first proof that provides an explicit bound. Similar results with the same consequences have been obtained independently by Nagle, Rdl, Schacht and Skokan.