Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 52
s OA, OB and OC, OD, then, in general, one and onlyone pair of rays OX, OY can be found such that OX and OYharmonically separate both OA, OB and 00, OD/^^) This last will be plain if we take a transversalcutting the four rays OA, OB, OC, OD in A, B, C, Drespectively, and then find the two points X,… … Fio, 17. This is the fundamental property of conjugatepoints discussed in Chap. II. Art. 1, No. IV. InFig. 17 tlie intersections X and Y liarmonically separatetlie pairs of conjugate points A, B and C, D. We may tlierefore regard the intersections of a givenline and a circle as the pair of points…
Geometry, Projective
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