Theaetetus (mathematician)

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Theaetetus (c. 417 B.C. – 369 B.C.) was a Greek mathematician of Geometry. 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 polyhedra.

He was described as having a short nose and protruding eyes. Much of what we know of him comes from Plato, who named a dialogue after him, the Theaetetus.

The Theaetetus crater on the Moon is named after him.

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