Badiou is the philosopher who attempts in the most original and coherent way to reestablish the regime of truth in contemporary thought, which was marked by Nietzschean deconstruction of this category. Specifically, he reintroduces it as the central category of philosophy, places philosophical practice in its effectiveness, and proclaims, in consonance with Lacan, that there are truths.

The texts that make up this volume constitute the first purely philosophical body of texts in Greek and participate in its conceptual framework of truth. Badiou unravels here the thread of truth from its point of origin, the ruptured local event, to the limit of its validity - what the truth process fails to name and what Badiou, in honor of Beckett, calls the unnameable. From the event to the unnameable, the trace of truth is systematically located by Badiou based on the fundamental concept of subtraction.

The texts included are:
- Definition of philosophy
- The event as beyond-being
- Lecture on subtraction
- Logic, philosophy, "linguistic turn"
- Althusser, the subjective element without subject
- Philosophy and psychoanalysis
- Subtraction and truth (by D. Vergetis)