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καὶ ὄψις: ‘sight also’ sc. as well as νόησις. ἠναγκάσθη. See 523 D note — 526 C Now consider — to which of these classes do number and ‘one’ belong? Our perception of ‘one’ is self-contradictory; for any unit which we see, we see both as one and as infinite in number. This is also true of number generally, since it is true of ‘one.’ The science of number is therefore a suitable study on educational as well as on utilitarian grounds, provided it is pursued in such a way as to lead the soul from visible to the invisible numbers of true mathematics. We may add that arithmetical studies are an excellent test of general capacity, a good intellectual discipline, and difficult.
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