Smart, Edward Howard · London : Macmillian and Co. · leaf 40
joins of correspondingangular points are concurrent. For as BC, B^C^ intersect, they lie in a plane. Likewise CA, C^A^ lie in a plane, as do also AB, A^Bj. Thesethree planes have one point V in common, and through thispoint must pass their common sections, taken in pairs. But these common sections… … PROeJECTION. DUALITY 13 A pencil of straight lines through a point projects into apencil of straight lines through the projection of the point. The first is self-evident (Fig. 3). For the second we notice that the planes containing V andthe several rays of the pencil each pass through the join of…
Geometry, Projective
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