Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 37
are 1 1 p. p-\ i-p, i-p 1-p \-p where p is the value of the cross-ratio correspond-ing to any given permutation. Corollary. When the range is harmonic the cross-ratio values are — 1, — 1, 2, 2, ^, h 14. The Complete Quadrangle. If p, Q, r, S be fourgiven points, and if PQ, RS meet in A; PR, SQ in… … Fig. 11 Harmonic Properties of the Complete Quadrangle.Project the line AC to infinity into AC.
Geometry, Projective
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