Smart, Edward Howard · London : Macmillian and Co. · leaf 258
(Fig. … Fro. 116a. Fig. 1166. Then {abcd} ^{ahcd} (§2 (a), Chap. XIV.)= {badc}(%2, Chap. XII.). .•. the joins of cross-intersectionsof corresponding rays pass throughthe cross centre (§5, Chap. XIII.). But these joins are (aa) to {bb), viz. h,{bd) to (ac), viz. k,{cc) to {dd), viz. I. .. h, k, I are…
Geometry, Projective
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