# De utilitate mathematicae 105

Theon Smyrnaeus, De utilitate mathematicae, Paragraph 105. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/theon-smyrnaeus/de-utilitate-mathematicae/105

τετάρτη δὲ τετρακτύς ἐστι τῶν ἁπλῶν 〈σωμάτων〉, πυρὸς ἀέρος ὕδατος γῆς, ἀναλογίαν ἔχουσα τὴν κατὰ τοὺς ἀριθμούς. ὅπερ γὰρ ἐν ἐκείνῃ μονάς, ἐν ταύτῃ πῦρ· ὃ δὲ δυάς, ἀήρ· δὲ τριάς, ὕδωρ· ὃ δὲ τετράς, γῆ. τοιαύτη γὰρ ἡ φύσις τῶν στοιχείων κατὰ λεπτο- μέρειαν καὶ παχυμέρειαν, ὥστε τοῦτον ἔχειν τὸν λόγον πῦρ πρὸς ἀέρα, ὅν ἓν πρὸς β΄, πρὸς δὲ ὕδωρ, ὃν ἓν πρὸς γ΄, πρὸς δὲ γῆν, ὃν ἓν πρὸς δ΄· καὶ τἆλλα ἀνάλο- γον πρὸς ἄλληλα.

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Theon Smyrnaeus, De utilitate mathematicae, ed. Eduardus Hiller. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Source: https://thegreeklibrary.pages.lisn.upsaclay.fr/works/tlg1724.tlg001.local001/.