Sidorenko's conjecture for a class of graphs: an exposition

preprint2012arXivOpen access

Abstract

A famous conjecture of Sidorenko and Erdős-Simonovits states that if H is a bipartite graph then the random graph with edge density p has in expectation asymptotically the minimum number of copies of H over all graphs of the same order and edge density. The goal of this expository note is to give a short self-contained proof (suitable for teaching in class) of the conjecture if H has a vertex complete to all vertices in the other part.

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