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 49
>.^c^d^. . .) and {a/b/c/d/ . . .) are obtained on the inter-secting plane, which are again projective. Their product is … Fig. 12. ^ Introduced by Poncelet, loc. cit., p. 94. PENCILS AND RANGES. 37 therefore a curve 0} the second order; in this case a conic. It willbe seen later on that all curves of the second order are identicalwith all conies. To show how a circle may be described as an envelope, assumefirst the…
Geometry, Projective · Geometry, Analytic
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