Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 242
ithrespect to the conic (Theorem 19). The triangle Ox02Oz is thereforeself-polar with respect to the conic. It follows readily also that thecondition is necessary. For the relation Ix • I2 = I3 leads at once tothe relation l2 = I1ls. If Ov 02, 03 are the centers respectively ofthe involutions I19… … Fig. 92 228 ONE-DIMENSIONAL PROJECTIVITIES [Chap, vm tion i.n.i.i.n1-i = i.n.n1.i = n.n1, A A, Coeollaky 1. Given any two involutions, there exists a third invo-lution which is harmonic with each of the given involutions. For if we take the two involutions on a conic, the involution whosecenter is…
Geometry, Projective
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