John Buridan on Logical Consequence

In Graziana Ciola & Milo Crimi (eds.), Validity Throughout History. Munich: Philosophia Verlag (forthcoming)
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Abstract

If an argument is valid, it is impossible for its premises to be true, and its conclusion false. But how should we understand these notions of truth and impossibility? Here, I present the answers given by John Buridan (ca. 1300-60), showing (i) how he understands truth in his anti-realist metaphysics, and (ii) how he understands modality in connection with causal powers. In short: if an argument exists and is valid, there does not exist a power capable of making the premises true and, at the same time, making the conclusion false.

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Boaz Faraday Schuman
University of Copenhagen

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