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 87
and the lowerportion of V lies in coincidence with the front part of H. Accord-ingly the projections of points in the different angles will lie asfollows with respect to GL: Point in I Angle U a TT (( U U JJJ u iJ-projection below, F-projection above GL above, above above, below below, below The… … Fig. 25. extended) to GL. A fixed point in space can be represented in oneand only one way by two projections. Conversely, two points inthe same perpendicular to GL always represent the projections 0}a point (but only one point). 2. Straight Line.—^A straight line is determined by twopoints (the…
Geometry, Projective · Geometry, Analytic
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