# De utilitate mathematicae 85

Theon Smyrnaeus, De utilitate mathematicae, Paragraph 85. Ancient Greek.

Canonical: https://interlinea.aeterna-institute.org/library/greek/theon-smyrnaeus/de-utilitate-mathematicae/85

διαφέρει δὲ διάστημα καὶ λόγος, ἐπειδὴ διάστημα μέν ἐστι τὸ μεταξὺ τῶν ὁμογενῶν τε καὶ ἀνίσων ὅρων, λόγος δὲ ἀπλῶς ἡ τῶν ὁμογενῶν ὅρων πρὸς ἀλλήλους σχέσις. διὸ καὶ τῶν ἴσων ὅρων διάστημα μὲν οὐδέν ἐστι μεταξύ, λόγος δὲ πρὸς ἀλλήλους εἶς καὶ ὁ αὐτὸς ὁ τῆς ἰσότητος· τῶν δὲ ἀνίσων διάστημα μὲν ἕν καὶ τὸ αὐτὸ ἀφʼ ἑκατέρου 〈πρὸς〉 ἑκάτερον, λόγος δὲ Κίερος καὶ ἐναντίος ἑκατέρου πρὸς ἑκάτερον· οἷον ἀπὸ τῶν βʹ πρὸς τὸ ἕν καὶ ἀπὸ τοῦ ἑνὸς πρὸς τὰ βʹ διάστημα ἕν καὶ τὸ αὐτό, λόγος δὲ ἕτερος, τῶν μὲν δύο πρὸς τὸ ἕν διπλάσιος, τοῦ δὲ ἑνὸς πρὸς τὰ βʹ ἥμισυς.

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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/.