Beginning with a sustained critique of the so-called ‘end of philosophy’, Badiou goes on to propose a new definition of philosophy, one that is tested with respect to both its origin, in Plato, and its contemporary state. The essays that follow are ordered according to what Badiou sees as the four great conditions of philosophy: philosophy and poetry, philosophy and mathematics, philosophy and politics, and philosophy and love. Conditions provides an illuminating reworking of all the major theories in Being and Event. In so doing, Badiou not only develops the complexity of the concepts central to Being and Event but also adds new ones to his already formidable arsenal. The essays in Conditions reveal the extraordinary and systematic nature of Badiou’s philosophical enterprise.