Theudius is aGreek mathematician of 4th century BCE, born inMagnesia, a member of thePlatonic Academy and a contemporary ofAristotle. He is only known fromProclus’ commentary toEuclid, where Theudius is said to have had "a reputation for excellence in mathematics as in the rest of philosophy, for he produced admirable "Elements" and made many partial theorems more general".^[1]

The "Elements" of Theudius are probably the source for Aristotle's mathematical examples.^{[citation needed]}

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• Euclid; Thomas L. Heath (1956).The thirteen books of Euclid's Elements. Dover Publications. p. 117. Retrieved7 June 2011.

Proclus. In primum Euclidis Elementorum librum commentarii. Ed. G. Friedlein. Leipzig, 1873, 67.12-16).

• 4th-century BC Greek mathematicians

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