An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 56
eA and B are the real double-points, a and b the real double-rays of the involution. It is noticed that in this hyperbolic invo-lution each pair is separated by the double-elements. Two pairseither exclude each other entirely, like CCr and DDf, or includeeach other entirely, like DD and EEr. If P… … Fig. 17- The polar of the center is the line at infinity. To every diam-eter a as a polar corresponds a pole A which is the infinite pointof the perpendicular diameter a. Thus a and af arc a pair ofthe polar involution about the center. In fact the rays of eachpair are perpendicular to each other.…
Geometry, Projective · Geometry, Analytic
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