Art. 139). The sides of a triangle ABC formed by three conics lying on a quadric whose planes are concurrent at P are touched by ... (Art. 1440) ; for any quadric may be projected into a sphere, and conics on the quadric, being plane sections, project into ... Or the theorem may be proved directly by generalizing the method of Art. 259, by using the tangential equations of cones with vertices at P, the oi- igin.
Title | : | A Treatise on the Analytic Geometry of Three Dimensions |
Author | : | George Salmon |
Publisher | : | - 1958 |
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