- Wilbur R. Knorr
- and Reviel Netz
ExtractTheaetetus (c. 415–369 bce) of Athens, geometer, initiated the special definitions and theory of irrational lines fundamental for book 10 of Euclid's Elements (cf. Eudemus, cited by Pappus, ed. Junge and Thomson, 63–4); one infers that he formulated a proportion theory based on the Euclidean division (anthyphairesis) and perhaps also set out the associated number theory of Elements, book 7.
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