Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 320
rojettiva (Naples, 1805), pp. 262-263. g)5] PROJECTIVE CONICS 305 line of intersection, I, of the two planes ; and provided the collineationbetween the two planes determined by the correspondence of the coniestransforms I into itself by a projectivity to which I belongs (in par-ticidar, if the… … points of this conic collinear with L and not on I. The conic is gen-erated by the two pencils A [P] and B [P] where P and P are con-jugates in the involution I on / (cf. Ex. 1, p. 137). Let A andB be the points homologous to A and B on the second conic, and letA be the point in which the second…
Geometry, Projective
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