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Theudius is a
Greek mathematician Greek mathematics refers to mathematics texts and ideas stemming from the Archaic through the Hellenistic and Roman periods, mostly extant from the 7th century BC to the 4th century AD, around the shores of the Eastern Mediterranean. Greek mathe ...
of 4th century BCE, born in Magnesia, a member of the
Platonic Academy The Academy ( Ancient Greek: Ἀκαδημία) was founded by Plato in c. 387 BC in Athens. Aristotle studied there for twenty years (367–347 BC) before founding his own school, the Lyceum. The Academy persisted throughout the Hellenisti ...
and a contemporary of
Aristotle Aristotle (; grc-gre, Ἀριστοτέλης ''Aristotélēs'', ; 384–322 BC) was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, he was the founder of the Peripatetic school of ...
. He is only known from
Proclus Proclus Lycius (; 8 February 412 – 17 April 485), called Proclus the Successor ( grc-gre, Πρόκλος ὁ Διάδοχος, ''Próklos ho Diádokhos''), was a Greek Neoplatonist philosopher, one of the last major classical philosophe ...
’ commentary to
Euclid Euclid (; grc-gre, Εὐκλείδης; 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 ...
, 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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Proclus. In primum Euclidis Elementorum librum commentarii. Ed. G. Friedlein. Leipzig, 1873, 67.12-16). {{Authority control Ancient Greek mathematicians Year of birth unknown Year of death unknown 4th-century BC mathematicians