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A point related to the construction and properties of Conic Sections.
See also Ellipse, Ellipsoid, Hyperbola, Hyperboloid, Parabola, Paraboloid, Reflection Property
References
Coxeter, H. S. M. and Greitzer, S. L. Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 141-144,
1967.