An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 40
o, where the pencils u—Xv = o and r—Xks = o have the given pointsas vertices. § 8. The Complete Quadrilateral.^ In § 5 it has been found that if p and q are hnear expressionsin X and y, ^ See Elemente der analytischen Geometric by F. Joachimsthal, pp. 131-142. PENCILS AND RANGES. 27 p = o,? = o,… … Fig. 9. /=o, 5 = 0 be the equations of two pairs of rays, Fig. 9. Theequations of the rays passing through the vertices of these pairsare of the form ap-\-^q = o and ar-\-^s = o respectively. Forcertain values of ct, /? and a, /? these equations may both rep-resent a ray passing through the…
Geometry, Projective · Geometry, Analytic
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