Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 240
BBt intersect in Ox and the lines AyA, B^Bintersect in 02. The Pascal line of the hexagon AA^ABB^ thenpasses through 01, 02 and the intersection of the lines AB and AB.But the latter point is a point on the axis of II. This proves the theorem. … Fig. 91 226 ONE-DIMENSIONAL PROJECTIVITIES [Chap, vm Cokollaey. A projectivity on a conic is the product of two invoke-tions, the center of one of which may be any arbitrary point [not adouble point) on the axis of the projectivity ; the center of the otheris then uniquely determined. Proof. Let…
Geometry, Projective
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