[357b]
the greater and the smaller, and the nearer and the remoter—is it not evident, in the first place, that measurement is a study of their excess and defect and equality in relation to each other?
This must needs be so.
And being measurement, I presume it must be an art or science?
They will assent to this.
Well, the nature of this art or science we shall consider some other time1; but the mere fact of its being a science will suffice for the proof which Protagoras and I