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 97
similitude of three spheres in space form a com-plete quadrilateral. … Fig. 34. In any orthographic projection the spheres are projected intocircles and the £s and /s into their centers of similitude; andsince any three circles in a plane may always be considered asthe projections of three spheres in space excluding one another, COLLIN RATION. 8S the foregoing…
Geometry, Projective · Geometry, Analytic
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