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 26
e indeed identical with the pre-vious values of a and b. li->^,a and b are conjugate complex numbers, i.e., the double-points of the involution are imaginary.In this case the middle point M of the mvolution is still real, a-\-b a , smce = - , and 2 r MX-MY= ^=—-^<o; 4 r r B a2X and Y are on… … i;i. ^ )y\\ Fig. 4. bolic in case of real double-points, elliptic in case of imaginarydouble-points, parabolic in case of coinciding double-points.
Geometry, Projective · Geometry, Analytic
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