Abstract

Theon of Smyrna was a professor of Platonism and, as the Platonists of his age, an exegete of the Timaeus. The only work we have, the Expositio rerum mathematicarum ad legendum Platonem utilium, is complete and consistent: it discusses the foundations and the characteristics of the τάξις that makes the world well structured. Theon found this doctrine in the Timaeus and in the Epinomis, and he argued it again through mathematical illustrations with the aim of demonstrating, according to Plato, the presence of harmony both in the incorporeal and in the corporeal realm: Theon’s purpose can’t be grasped without referring to his platonic exegetical activity.