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 24
ment EZ at P: then bisect the segmentPZ at M: and then bisect the segments MZ, etc. . . . untilone of the middle points P, M,. . . falls on the segment LZ. Let this point, for example, be the point M. Draw MN perpendicular to EZ, meeting ZD in N, Equidistant Straight Lines. g Finally from Z£>… … G To prove this it would be necessary to show that theequal segments ZN, JVS, . . ., which have been cut off oneafter the other firom the line ZD, have equal projections onZ£. We do not discuss this point, as we must return to itlater (p. 11). In any case the reasoning is suggested directlyby…
Geometry, Non-Euclidean
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