My purpose in this paper is to investigate the ontological structure of the theory that Plato ascribes to Protagoras in the Theaetetus (152–160). My interest is not just historical—what I wish to do is to explore the contemporary significance of Plato's Protagorean thesis, especially with regard to the theory of truth and the theory of perception. Even so, I shall attempt to say quite a lot about the text—I think that certain recent interpreters (especially M. F. Burnyeat ) are on the wrong track with regard to Protagorean relativism, precisely due to their misjudging the relation of the Theaetetus doctrine to more recent philosophy.
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