Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 128
theorem. EXERCISE Give the space duals of the preceding definitions and theorems. Keturning now to the construction in the preceding section for thepoints of a point conic containing five given points, we recall that § 42] TANGENTS 113 the point of intersection Cx of a line I through B2 was… … Tig. 52 of the tangent at B2 with I, and the collinearity of the points A, B, Cmay be stated as follows : Theoeem 6. If the vertices of a simple plane five-point are pointsof a point conic, the tangent to the point conic at one of the verticesmeets the opposite side in a point collinear with the…
Geometry, Projective
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