John Buridan on Logical Consequence

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