- Wilbur R. Knorr
ExtractTheodorus (2) (fl. late 5th cent. bce) of *Cyrene, geometer, portrayed in *Plato(1)'s Theaetetus as a former disciple of *Protagoras, an associate of *Socrates, and a teacher of *Theaetetus. Plato describes him as showing the irrationality of √3, √5, etc. up to √17 (Tht.
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