| Sumario: | "De propositionibus" is the first treatise of John Buridan's "Summulae dialecticae", a textbook he wrote for his logic courses in the Faculty of Arts at the University of Paris. As the bearers of truth and falsity, propositions are the primary concern of logic, the art that serves as a general tool for reaching truth and avoiding falsity in any field of knowledge. Most important is Buridan's commitment to the semantic primacy of mental language and the treatment of written and spoken propositions as conventional signs. In "De propositionibus", Buridan develops his nominalist conception of the relations between mind, language, and reality, which he goes on to employ in the subsequent eight treatises of the "Summulae".
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