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[522c] something that applies to all alike.1” “What?” “Why, for example, this common thing that all arts and forms of thought2 and all sciences employ, and which is among the first things that everybody must learn.” “What?” he said. “This trifling matter,3” I said, “of distinguishing one and two and three. I mean, in sum, number and calculation. Is it not true of them that every art and science must necessarily partake of them?” “Indeed it is,” he said. “The art of war too?” said I. “Most necessarily,” he said.

1 Cf. Symp. 186 Bἐπὶ πᾶν τείνει.

2 διάνοιαι is not to be pressed in the special sense of 511 D-E.

3 A playful introduction to Plato's serious treatment of the psychology of number and the value of the study of mathematics.

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