Smart, Edward Howard · London : Macmillian and Co. · leaf 45
Fig. (5. We have therefore a dual way in which geometrical figuresmay be obtained according as the generating element is apoint or a straight line. Let us consider a few of the simplest examples of suchfigures. We arrange them side by side, taking for the left-hand side the point as the primary… … Fig. 7a. Between such a pair of corresponding figures we have thena point-to-line and line-to-point correspondence. P.O. 18 PROJECTIVE GEOMETRY We have thus as pairs of corresponding figures: A range of points lying on astraight line. The figure obtained by taking3 non-collinear points and…
Geometry, Projective
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