[Revised entry by Sophie-Grace Chappell and Francesco Verde on February 7, 2025.
Changes to: Main text, Bibliography]
This article introduces Plato’s dialogue the Theaetetus (section 1), and briefly summarises its plot (section 2). Two leading interpretations of the dialogue, the Unitarian and Revisionist readings, are contrasted in section 3. Sections 4 to 8 explain and discuss the main arguments of the chief divisions of the dialogue. Section 9 provides some afterthoughts about the dialogue as a whole. One of the most challenging issues in this dialogue, as in all Platonic dialogues, is the comparison with Plato’s other…

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