Ancient Greek · ~3 min
Page 22
Iamblichus, Περὶ τῆς Νικομάχου ἀριθμητικῆς εἰσαγωγῆς 22
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φύσει εἶναι τὰ συζύγως ἑκατέρωθεν αὐτοῦ· ἐνάκι γὰρ θʹ τῷ ἅπαξ αʹ, ὀκτάκι δὲ ὀκτὼ τῷ δὶς δύο, ἑπτάκι δὲ ἑπτὰ τῷ τρὶς γʹ, ἑξάκι δὲ ἓξ τῷ τετράκι δʹ, μόνον δὲ αὐτὸ ἑαυτῷ τὸ πεντάκις πέντε. ἔτι τὸ μὲν ἐνάκι εʹ τῷ ἅπαξ εʹ, τὸ δὲ ἐνάκι ϛʹ τῷ ἅπαξ δʹ, τὸ δὲ ἐνάκι ζʹ τῷ ἅπαξ γʹ, τὸ δὲ ἐνάκι ὀκτὼ τῷ ἅπαξ δύο. καὶ πάλιν τὸ ὀκτάκις ζʹ τῷ δὶς γʹ καὶ τὸ ὀκτάκις ϛʹ τῷ δὶς δʹ 〈καὶ τὸ ὀκτάκις εʹ τῷ δὶς εʹ〉 καὶ τὸ ἑπτάκις ϛʹ τῷ τρὶς δʹ 〈καὶ τὸ ἑπτάκις εʹ τῷ τρὶς εʹ〉. καὶ ἄλλως τὸ μὲν ἑξάκι εʹ τῷ τετράκι εʹ, εἰ καὶ μὴ τῷ ὀνόματι ἀλλά γε τῇ δυνάμει, ὥσπερ καὶ ἀπεδείξαμεν