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 44
ely, Fig. 10. These determine two projective pencils ofrays through the points L and L. Taking c and c as bearersof two ranges of points, obtained by the intersections of a, h, PENCILS AND RANGES. 31 c,... and a, b, c with c and </, respectively, we have accord-ingly the projective ranges (c-abd… … Fig. 10. Hence, if any ray x of the first pencil is given, we know thatthe corresponding ray x/ will be situated in such a mariner thatthe Hne joining {xd) and {o^c) will pass through P, and x isfound by joining the point of intersection of x and c to P bya line ^. The line joining U to the point…
Geometry, Projective · Geometry, Analytic
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