Abstract
This translation has been rendered in order to compensate for the absence of any recent commentary in French on Aristotle's Categories, that work which Simplicius insisted is the proem to all Philosophy since this treatise is a source of logic, and logic precedes all Philosophy. Besides offering as literally and accurately as possible the sense of Aristotle's text, this volume contains as well the interesting commentary inspired by the teaching of Ammonius of Hermeias, which to this date has not been accessible in any modern Western European language.