Theudius is a Greek mathematician of 4th century BCE, born in Magnesia, a member of the

Platonic Academy The Academy (), variously known as Plato's Academy, or the Platonic Academy, was founded in Classical Athens, Athens by Plato ''wikt:circa, circa'' 387 BC. The academy is regarded as the first institution of higher education in the west, where ...

and a contemporary of

Aristotle Aristotle (; 384–322 BC) was an Ancient Greek philosophy, Ancient Greek philosopher and polymath. His writings cover a broad range of subjects spanning the natural sciences, philosophy, linguistics, economics, politics, psychology, a ...

. He is only known from

Proclus Proclus Lycius (; 8 February 412 – 17 April 485), called Proclus the Successor (, ''Próklos ho Diádokhos''), was a Greek Neoplatonist philosopher, one of the last major classical philosophers of late antiquity. He set forth one of th ...

’ commentary to

Euclid Euclid (; ; BC) was an ancient Greek mathematician active as a geometer and logician. Considered the "father of geometry", he is chiefly known for the '' Elements'' treatise, which established the foundations of geometry that largely domina ...

, 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".Proclus. A Commentary on the First Book of Euclid’s Elements. Translated with an Introduction and Notes by G. R. Morrow. 1970 (repr. Princeton: Princeton University Press, 1992) The "Elements" of Theudius are probably the source for Aristotle's mathematical examples.

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External links

Proclus. In primum Euclidis Elementorum librum commentarii. Ed. G. Friedlein. Leipzig, 1873, 67.12-16). {{Authority control Year of birth unknown Year of death unknown 4th-century BC Greek mathematicians