Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 124
Fig. 49 Fig. 50 of a line conic is called a cone of lines. The point through whichpass all the lines (or planes) of a cone of lines (or planes) is calledthe vertex of the cone. The point conic, line conic, cone of planes,and cone of lines are called one-dimensional forms of the second degree.^The…
Geometry, Projective
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