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 237
ruments, the common perpendicularto two lines which are not parallel and do not meet eachother (the non-intersecting lines); the common parallel to thetwo Hues which bound an angle; and the line which is per-pendicular to one of the bounding lines of an acute angleand parallel to the other. We… … Fig. 80. Let a = Ai_A^ b = Bj,B, be two non-intersecting lines;that is, lines which do not meet each other, and are notparallel (cf. Fig. 80). I Neue Begiiindung der Bolyai-Lobatschefskyschen Geometrie.Math. Ann. Bd. 57, p. 137—150 (1903). Hilberts Gruyidlagen derGeometrie, 2. Aufl., p. ro7 at seq.…
Geometry, Non-Euclidean
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