Non-Euclidean geometry; a critical and historical study of its development (1912)
Bonola, Roberto, 1874-1911, Carslaw, H. S. (Horatio Scott), 1870-1954 · LaSalle, Ill. : Open Court Publishing Co. · leaf 187
Fig. 61. Fig. 62. Denoting by a the ordinary distance of the two pointsM and O, the homogeneous coordinates of the line MN andthe line OM axQ, respectively {a, i, — a), (i, O, o) and thecoordinates of their common point are (o, a, 1). Then from (4) of the preceding article,sin <^ OMN = \^i-a2.…
Geometry, Non-Euclidean
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