Category Archives: Theaetetus

Perception, Knowledge, and Being

The discussion in the Theaetetus really takes off when Theaetetus tries out his first definition of knowledge, suggesting that it’s “nothing other than perception” (οὐκ ἄλλο τί ἐστιν ἐπιστήμη ἢ αἴσθησις) (151e). Socrates immediately equates this definition with the sophist Protagoras’s claim that “Man … Continue reading

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Intension vs. Extension in the “Theatetus”

Plato’s Theaetetus really gets going when Socrates asks Theatetus to define knowledge (145e), and Theaetetus answers with a list: whatever you can learn from Theodorus (Theaetetus’s teacher), or (perhaps implicitly) another expert: disciplines such as geometry, and crafts such as cobbling. Socrates then … Continue reading

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