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.
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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Articles in the same Issue
- Frontmatter
- Articles
- Un commento di età imperiale al libro secondo dell’Etica Nicomachea. Traduzione con introduzione e note
- On Plato’s Precosmos (Ti. 52d2–53c3)
- Per una spiegazione causale delle differenze tra gli animali: Aristotele, Historia animalium I 1
- Alexander of Aphrodisias and the Active Intellect as Final Cause
- L’interprétation astrologique de la philosophie naturelle d’Aristote selon Alexandre d’Aphrodise et Bardesane le Syrien
- L’articulation des chapitres 19 et 20 du traité VI, 2 [43] de Plotin. La priorité du genre sur ses espèces
- Notes
- Une citation littérale de Mélissos dans le Sophiste de Platon
- Notes on Prior Analytics II 22.68a16–21
- Reviews
- Vera Calchi: The Theology of the Epinomis
- Vincenzo Damiani: La Kompendienliteratur nella scuola di Epicuro. Forme, funzioni, contesto