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 183
er oj no solution, or oj an infinite number oj solutions. Theangle 0 does not depend upon the angles 0 oj even indices. To sum up we may state Cremonas problem and its solutionby the following proposition: // rays oj light emanate jrom a fixed source which, in succession,are reflected on n straight… … Fig. 72. the first case there are two places on the conic at which the originaland the final ray make a given angle. In the second case there areno such places on the circle, or else an infinite number. In this )<f>=90
Geometry, Projective · Geometry, Analytic
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