Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 234
h the tangents at pairs of homol-ogous points are homologous. Proof. This follows at once from the fact that the collineation inthe plane of the conic which generates the projectivity transformsthe tangent at any point of the conic into the tangent at the homol-ogous point, and hence also generates… … Proof. Let AA!, BB, CC (fig. 89) be three pairs of homologouspoints (AA being distinct), and let AB and ABf, AC and AC, meetin points R and S respectively, which determine the axis of the pro-jectivity of points. Now the polar of B with respect to the conic isdetermined by the intersections of the…
Geometry, Projective
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