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Topic: Conic eccentricity through five points
Replies: 8   Last Post: Jul 22, 2013 2:08 PM

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Brian Q. Hutchings

Posts: 6,427
Registered: 12/6/04
Re: Conic eccentricity through five points
Posted: Jun 12, 2013 4:01 AM
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nine points, no four of which arte coplamar,
determine a quadric surface; wierd.

> what is wrong with tripolars;
> what is the best invariant for a quadric surface

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