<!doctype html public «-//w3c//dtd html 4.0 transitional//en»> http-equiv=content-type> From the dawn of philosophy, the model of substantive difference has stood alongside the model of quantitative difference. Quantitative difference – that is, variance in a single quality according to intensity or quantity – has taken on increasing importance since the early modern and modern eras. This book examines conceptions of difference from ancient times to the present, from Plato to Deleuze.