Dandelin's theorem

Argomento:Cono

* Move points A and B to change section of the cone * Spheres are tangent to the plane and to the cone * Move point P on the conic * When the conic is an ellipse, why is MP+PH constant ?

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Erdős's problem #503, n=3
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Use a matrix with its elements as functions
Matrices - Basic Terminology
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Kettenlinie gegen Parabel
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Baricentro o centro di massa
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