Projection pencil of quadrics and Ivory theorem

Details Projection pencil of quadrics and Ivory theorem Projection pencil of quadrics and Ivory theorem

2009-05-25

arxiv.org/abs/0905.4093v1

Mathematics

Metric Geometry

14 pages

Scientific paper

We rewrite the property of confocality with respect to a pseudo-Euclidean space. Our observation is that the generalized definition of confocality in $\cite{stachel}$ does not give back to the original definition of confocality of Euclidean conics. The "confocality property" of $\cite{stachel}$ can be get from our definition in the case when the projection transformation is regular, it is the identity transformation of the space. Our examination concentrate to the singular cases, too because they are playing important role in the investigations of essential examples.

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