Conic Involution
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The lines which join corresponding points in an involution on a conic all pass through a fixed point; and reciprocally, the points of intersection of conjugate lines in an involution among tangents to a conic lie on a line.
Keywords
ellipse, ellipses, conic sections, conic, line, tangent, involution, corresponding, intersectionGalleries
Conic Sections: EllipsesSource
Encyclopaedia Britannica (New York: The Encyclopaedia Britannica Company, 1910) 11:702
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