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 91
any line I with Q,produce I and I till they intersect at X; X represents the coinciding 7« PROJECTIVE GEOMETRY. projections of the required point of intersection, Fig. 27. If thispoint X is infinitely distant, i.e., if / || I, then / is parallel to Q. If a plane P is given, then all lines in this… … s, 5; this line is therefore the axis of affinity which exists betweenthe projections of figures in a plane P. If A is a point in P(traces sl9 s2), then we can rabat P about st into H. During COLLIN EATION. 79 the rabattement A describes a circle with center in st; A describesa perpendicular to sv…
Geometry, Projective · Geometry, Analytic
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