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 60
n into tz,without changing 5 and q and the distances of C and r, C and q,S and r, and 5* and q in these planes. After the motion there is still CR \\ and = QS, and SP=SP;consequently the distances PR and PS are not changed by the COLLINEATION. 47 motion. From this it follows that after the motion… … Fig. 18. between the figure in space and its projection. After the rabatte-ment, Fig. 18 assumes the form of Fig. 19. In this figure / and V are the two corresponding lines whichwith 5 and SC form a pencil of four rays through S. As thispencil is intersected by the rays CP and CQ, we have (CLPP) =…
Geometry, Projective · Geometry, Analytic
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