Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 184
e plane not on lmis represented by a pair of numbers; and, conversely, every pair ofnumbers of which one belongs to the scale on the rc-axis and theother to the scale on the y-axis determines a point in the plane (thepair of symbols oox> coy being excluded). The exceptional characterof the… … 0= Ox= Oy Fig. 7i 170 COORDINATE SYSTEMS [Chap, vn the point oo in the case of the analytic treatment of the points of aline (§ 58). The two numbers just described, determining the pointP, are called the nonhomogeneous coordinates of P with reference to
Geometry, Projective
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