Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 249
erms of X, we note,first, that from the constructions given, any line through N meets theconic (if at all) in two points whose sum in the scale is 0. In par-ticular, the points 1,-1 on the conic are collinear with N and thepoint 1 on the a>axis, and the points X, — X on the conic are… … Fig. 97 §82] PARAMETRIC REPRESENTATION 235 the «-axis meets the conic (if at all) in two points whose product isconstant, and hence equal to — X2. The line joining the point x on thea>axis to the point — 1 on the conic therefore meets the conic again inthe point X2. But now we have 0, co, 1, X2…
Geometry, Projective
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