Smart, Edward Howard · London : Macmillian and Co. · leaf 37
^ geometric figure X in a plane a. (Fig. 2.)Take any point V not in this plane. … Fig. 2. Let straight lines or rays be drawn from V to every pointof the figure X. Let another plane a cut this system of rays. Then as each ray can cut a plane in one point only, to eachpoint of the figure X in plane a corresponds a point in plane a. 10 PROJECTIVE GEOMETRY The assemblage of these…
Geometry, Projective
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