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if so, how can this be shown mathematically?

This is just purely out of curiosity.

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- Thread starter TheFerruccio
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- #1

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if so, how can this be shown mathematically?

This is just purely out of curiosity.

- #2

tiny-tim

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If you construct an ellipse using a cone, does the axis of the cone cross through one of the foci of the ellipse?

Sorry … noooo.

The foci are the points at which the Dandelin spheres touch the plane of the ellipse (or hyperbola) … see the PF library entry " conic " for details.

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- #4

tiny-tim

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Not that

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