Theaetetus (mathematician)
Greek mathematician (c.417-c. 369 BCE)
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Theaetetus of Athens (Greek: Θεαίτητος; c. 417 – c. 369 BC), possibly the son of Euphronius of the Athenian deme Sunium, was a Greek mathematician. His principal contributions were on irrational lengths, which was included in Book X of Euclid's Elements, and proving that there are precisely five regular convex polyhedra. A friend of Socrates and Plato, he is the central character in Plato's eponymous Socratic dialogue.
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