The One

Alain Badiou’s 1983–1984 lecture series focuses on the philosophical concept of oneness in the works of Descartes, Plato, and Kant—a crucial foil for his signature metaphysical concept, the multiple.

Alain Badiou is emeritus professor of philosophy at the École normale supérieure in Paris. His seminars published by Columbia University Press include Lacan (2018), Malebranche (2019), and Images of the Present Time (2023).

Jacques Lezra is professor and chair of Hispanic studies at the University of California, Riverside.

Susan Spitzer is a frequent translator of Badiou’s works.

Kenneth Reinhard is research professor of comparative literature and English at the University of California, Los Angeles.

Jelica Šumič Riha, Institute of Philosophy, ZRC SAZU, Slovenia:
In this daring and challenging work, Badiou, one of the most fascinating and intellectually provocative thinkers of our time, provides a remarkable examination of the impasses of the metaphysics of the One in Descartes, Plato, and Kant. Badiou adapts their grappling with the equivalence of being and one to his own project of thinking the proper object of philosophy: the triad of events, truths, and subjects setting out from the idea that being is detached from the One. Knitting together mathematics and philosophy, Badiou makes a compelling demand for what he calls The Critique of Evental Reason.

Frank Ruda, author of For Badiou: Idealism without Idealism:
Badiou’s seminar is a space of conceptual experimentation and system creation, bringing together rigorous critique of contemporary ideology with innovative returns to major figures from the history of philosophy. This book, which also provides incisive introductory material, demonstrates the power of Badiou’s method. His readings of Descartes, Plato, and Kant not only are genuinely inventive, they also attest to the creation of one of the most significant philosophical endeavors of our era, Badiou’s own.

Todd McGowan, author of Enjoyment Right & Left:
The publication of Alain Badiou’s seminar The One is a major event for the philosopher of the event. When reading it, one has a sense of thinking alongside a great thinker as he formulates one of his central ideas—the distinction between the One and the count-as-one. Come to this seminar for Badiou’s most in-depth analysis of how the One functions and leave with the incredible bonus of magisterial interpretations of Descartes, Plato, and Kant. This is Badiou at his very best and at his most accessible. The perfect introduction to his foundational work Being and Event.

Sigi Jöttkandt, author of First Love: A Phenomenology of the One:
Alain Badiou’s seminars are essential to understanding the evolution of his thought. This much-awaited collection of Badiou’s teachings enables the English-speaking world to experience the ‘true heart’ of his philosophy.