A new interpretation is proposed of the crucial expression «ἑνὶ ὀνόματι» (“in one name”) as applied to ratios of the musical concords in the preface of the Sectio canonis ascribed to Euclid. A link is also established with the name of one of the irrational lines introduced by Euclid in Elements 10. Past interpretations of the expression are discussed and shown to be inadequate. Published Online (2021-04-30)Copyright © 2021 by Fabio Acerbi Article PDF Link: https://jps.library.utoronto.ca/index.php/aestimatio/article/view/37577/28592 Corresponding Author: Fabio AcerbiCNRS, ParisE-Mail: fabacerbi@gmail.com

Original publication: Acerbi, Fabio. "The Meaning of «ἑνὶ ὀνόματι» in the Sectio canonis." Aestimatio: Sources and Studies in the History of Science 1: 2021. 37–54. DOI: 10.33137/aestimatio.v1i1.37577. This material has been re-published in an unmodified form on the Canadian HSS Commons with the permission of Iter Canada / Aestimatio: Sources and Studies in the History of Science. Copyright © the author(s). Aestimatio: Sources and Studies in the History of Science is distributed under a Creative Commons Attribution-NonCommercial-NoDerivatives License (CC BY-NC-ND 4.0). For details, see creativecommons.org/licenses/.