Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 247
Fig. 94 the point 1. The inverse operations (subtraction and division) lead toequally simple constructions. Since the scale thus denned is obviouslyprojective with the scale on a line, it is not necessary to derive againthe fundamental properties of addition and subtraction, multiplicationand…
Geometry, Projective
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