Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 324
rmine a cone. The three conies being proper, the quadric must con-tain proper points even though the lines m, m are improper. * In this corollary and in Theorem 12 the term quadric surface must be takento include the points on a cone of lines as a special case. 105] QUADKIC THROUGH NINE POINTS 309… … Fig. Ill Assign the notation so that 1, 2, 3 are in #. A quadric surface whichcontains the six points must meet the two planes in two conies A2,B2 which meet the line a/3 = c in a common point-pair or point ofcontact; and every point-pair, proper or improper or coincident, of cdetermines such a…
Geometry, Projective
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