The Being and Event trilogy is the philosophical basis of Alain Badiou's entire oeuvre. It is formed of three major texts, which constitute a kind of metaphysical saga: Being and Event (1988). ), Logics of the Worlds (2006) and finally The Immanence of Truths, which he has been working on for 15 years. The new volume reverses the perspective adopted in Logics of Worlds.