Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 243
12) as the intersection with the conic ofthe line joining A to the intersection of the line AA[ with the axis I.In like manner, II (^ is determined as the intersection with theconic of the line joining A to the intersection of the line AXA withthe axis I. Hence II (AJ = A[, and hence II • n^) = A[.… … Fig. 93 § 79] INVOLUTIONS 229 same as the one listed as Type 2, p. 209. If, however, our geometryadmits of a line in the plane of a conic but not meeting the conic, theargument just given proves the existence of a commutative groupnone of the projectivities of which have a double point. Theoeem 23.…
Geometry, Projective
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