Quadrics of Revolution through a Given Conic
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DOI:
https://doi.org/10.18311/jims/1928/17311Abstract
From the view-point ot Projective Geometry, the quadrics considered in this paper are those which pass through one conic and have double contact with another.
When a quadric becomes singular tangentially, it stands for a definite plane and a definite conic in that plane. Hence two conies in space determine two other covariant conies, all the four being the singular members of the same tangential pencil.