It would be difficult to overestimate the impact of Jacques Lacan’s work on Badiou. In the “Formulas of L’Étourdit”, Badiou is blunt: “my guiding thread is going to be, as always, Lacan’s relation to philosophy. Ultimately, this is the only thing that interests me” (2006d: 81-2). With regard to philosophy, then, Badiou heeds Lacan – “Psychoanalysis gives us a chance, a chance to start again” (Lacan 2008: 76) – precisely in order to return philosophy to itself. Given that Badiou is not an analyst, an analysand, a theorist of literature, film, culture or the psychology of the social, any examination of Badiou’s relation to Lacan has to take this orientation as its guiding thread. In short, Badiou’s confrontation with Lacan, the exemplary anti-philosopher, is for philosophy alone.