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 223
Serpentine. This cubic is obtained when all four points of the funda-mental quadruple are either real or imaginary. As the case 1 This section has been published in The University of Colorado Studies,Vol. I., No. 4, Feb. 1904. 2IO PROJECTIVE GEOMETRY. with four real points has so far always been… … Fig. 87. arbitrary fixed point B the circles of this system cut out an invo-lution of points whose double-points X and X are two points ofthe cubic associated with the point B in the Steinerian transfor-mation belonging to the given imaginary quadruple. To constructX and X, let g cut the line m,…
Geometry, Projective · Geometry, Analytic
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