Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 23
tonce to properties of higher geometry (e.g. of conies);and, conversely, that many general theorems on conies,etc., can be proved after projection by quite elementarymethods. 2. Notation. We shall denote points by capital letters, A, B, C, etc. „ „ lines „ small „ a, h, c, etc. „ |)^a7?es „ Greek „… … PROJECTIVE GEOMETRY 3. Method of Projection.Let TT and tt be two given fixed planes and O a given fixed point. Let P be any point inthe plane tt. Join O toP meeting tt in thepoint P. P is called the projec-tion of the point P ont/ie plane tt with respectto the Vertex of Projec-tion O. Fio. 1.…
Geometry, Projective
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