77. ἀριθμητική. In Gorg. 451B ff. ἀριθμητική is said to be
a science concerned with τὸ ἄρτιόν τε καὶ περιττόν, ὅσα ἑκάτερα
τυγχάνει ὄντα, whereas the function which is here assigned to
ἀριθμητική is there given to λογιστική: τὰ μὲν ἄλλα καθάπερ ἡ
ἀπιθμητικὴ ἡ λογιστικὴ ἔχει: ρεπὶ τὸ αὐτὸ γάπ ἐστιν τό τε ἄπτιον
καὶ τὸ ρεπιττόν: διαφέπει δὲ τοσοῦτον, ὅτι καὶ ρπὸς αὑτὰ καὶ ρπὸς
ἄλληλα πῶς ἔχει πλήθονς (cf. ll. 71 ff. τὸ πλέον—τὸ ἔλαττον ἢ
αὐτὸ πρὸς ἑαυτὸ ἢ τὸ ἕτερον πρὸς τὸ ἕτερον) ἐπισκοπεῖ τὸ περιττὸν καὶ
τὸ ἄρτιον ἡ λογιστική.
79. εἶεν—ἐπεὶ δὲ δή. The MSS. read ἐπειδὴ δέ, but after εἶεν
Plato regularly uses δὲ δή in coming to the application of a train
of reasoning or illustrations: cf. 312Eεἶεν: ὁ δὲ δὴ σοφιστὴς περὶ
τίνος δεινὸν ποιεῖ λέγειν; and 311Cεἶεν—παρὰ δὲ δὴ Πρωταγόραν
κτλ.
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