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Notes on Prior Analytics II 22.68a16–21

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Published/Copyright: June 21, 2023
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Abstract

At Prior Analytics II 22.68a16–21, Aristotle argues that if A is predicated of all B and C and nothing else, and B is predicated of all C, then A and B convert. In justifying his argument, however, he appears to claim that B is not predicated of all A. This claim has long been a cause of puzzlement to commentators. A widespread view is that the kind of conversion discussed in the passage at issue should be explained in both extensional and intensional terms. After providing some textual evidence that Aristotle only apparently claims that B is not predicated of all A, I give a purely extensional account of Aristotle’s argument. This account is plausible, conservative and simpler than any of the intensional accounts that have been proposed so far.


Corresponding author: Riccardo Zanichelli, Istituto Europeo di Studi Superiori, Reggio Emilia, Italy, E-mail:

Acknowledgment

Thanks for helpful discussion are due to Paolo Crivelli and Guido Gherardi. I am grateful for comments from an anonymous referee.

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Published Online: 2023-06-21
Published in Print: 2023-06-27

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