# De utilitate mathematicae 91

Theon Smyrnaeus, De utilitate mathematicae, Paragraph 91. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/theon-smyrnaeus/de-utilitate-mathematicae/91

ἀναλογίας δὲ ὁ μὲν Θράσυλλός φησιν εἶναι προ- ηγουμένας τρεῖς, ἀριθμιητικὴν γεωμετρικὴν ἁρμονικήν· ἀριθμητικὴν μὲν τὴν ταὐτῷ ἀριθμῷ ὑπερέχουσαν καὶ ὑπερεχομένην, 〈οἷον . . . . . . . . . . .· γεωμετρικὴν δὲ τὴν ταὐτῷ λόγῳ ὑπερέχουσαν καὶ ὑπερεχομένην,〉 οἷον δι- πλασίῳ ἢ τριπλασίῳ, ὡς γ΄ ς΄ ιβ΄· ἁρμονικὴν δὲ τὴν ταὐτῷ μέρει τῶν ἄκρων ὑπερέχουσαν καὶ ὑπερεχομένην, οἷον τρίτῳ ἢ τετάρτῳ, οἷον ϛ΄ η΄ ιβ΄. . . . . . . . . . . .

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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/.