Higher geometry; an introduction to advanced methods in analytic geometry (1922)
Woods, Frederick S. (Frederick Shenstone), 1864- · Boston, New York, Ginn and Company · leaf 35
Fig. 6 22 ONE-DIMENSIONAL GEOMETRY … Fig. 7 Two pencils of lines are in perspective when they are in per-spective to the same range of points as in Fig. 7. The pointsof intersection of correspondinglines of the two pencils then lieon the same straight line. Thatthe relation is a projectivityfollows from IV, § 15. From these…
Geometry, Analytic
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