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 221
p. 118. Hence the theorem: Die Kurven drifter und vierter Ordnung, welche durch die unendlich fernenKreispunkte gehen. (Zeitschr. f. Math., XXXII, 1887.) 208 PROJECTIVE GEOMETRY. The locus of the foci of all conies inscribed to a quadrilateralis a circular cubic having the circular points as a… … Fig. 86. But if two projective pencils of circles G+ XG^^o and G+ XG^=o produce a cubic, say GG^—Gfi=o, so that this equationreduces to Gg/—G-i^g = o, where g/ and g are hnear factors,then the cubic may also be produced by two projective pencilsof circles and rays. 4. In the same circular cubic…
Geometry, Projective · Geometry, Analytic
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