%0 Journal Article %T On the logarithimic calculus and Sidorenko's conjecture %A J. L. Xiang Li %A Balazs Szegedy %J Mathematics %D 2011 %I arXiv %X We study a type of calculus for proving inequalities between subgraph densities which is based on Jensen's inequality for the logarithmic function. As a demonstration of the method we verify the conjecture of Erd\"os-Simonovits and Sidorenko for new families of graphs. In particular we give a short analytic proof for a result by Conlon, Fox and Sudakov. Using this, we prove the forcing conjecture for bipartite graphs in which one vertex is complete to the other side. %U http://arxiv.org/abs/1107.1153v1