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Those magnitudes are said to be commensurable which are measured by the same measure, and those incommensurable which cannot have any common measure.
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Σύμμετρα μεγέθη λέγεται τὰ τῷ αὐτῷ μέτρῳ μετρούμενα, ἀσύμμετρα δέ, ὧν μηδὲν ἐνδέχεται κοινὸν μέτρον γενέσθαι.
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