An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 65
Fig. 20a. … If k is negative, P and Pf are on different sides of C, and thecenter lies between n and 7r. If k = — if the center is in themiddle of nr and n and the perspective becomes central symmetry,Fig. 206. COLLINE ATI ON. 53 C. Affinity.1—By this term we designate a perspectivewhose center is at an…
Geometry, Projective · Geometry, Analytic
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