Author:Theætetus of Athens

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Theætetus of Athens
(c. 417 BCE – c. 369 BCE)
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Classical Greek mathematician, contemporary of Plato and like him also student of Theodorus. His principal contributions were on irrational lengths (included in Book X of Euclid's Elements) and in proving that there are precisely five regular convex polyhedra.

Works

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Some or all works by this author were published before January 1, 1929, and are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.

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