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 209
Fig. 81. one branch, Fig. 81. 196 PROJECTIVE GEOMETRY. … Fig. 82. III. e1 = e2 and e3 all real.Equation (3) assumes the form y2=a{x— e^)2(x— e3). To get real values for y, x>e3-The point x=e19 y = o satisfies theequation also; but it is an isolatedpoint, Fig. 82. Correspondingly, in the quadrupletwo points are real and two coincide. IV. e1 and e2 = e3…
Geometry, Projective · Geometry, Analytic
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