Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 131
cis perspective with the triangle formed by the tangents at these points,the tangent at any vertex being homologous with the side of the firsttriangle which does not contain this vertex. Corollary. If Pv P3, Pi are three points of a point conic, the linesP3PV P3P± are harmonic with the tangent at… … Fig. 56 43. The tangents to a point conic form a line conic. If Pv P2, P3, P, are points of a point conic and pv p2, p3, p± are the tangents to theconic at these points respectively, then (by Theorem 8) the line join-ing the diagonal points (i^) (PZP^) and (P^) (P^Ps) contains the inter-section of…
Geometry, Projective
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