English summary: Since its discovery and first publication in Italy in 1970, Peter Olivi's Tractatus de contractibus has received widely divergent appreciation. Olivi was one of the most innovative thinkers of the latter third of the 13th century.From physics to metaphysics, to Biblical exegesis, Olivi was capable of questioning and overthrowing common perceptions. French description: Depuis sa decouverte et sa premiere publication...