e/Quadric (projective geometry)

Information
has gloss	eng: In projective geometry a quadric is the set of points of a projective space where a certain quadratic form on the homogeneous coordinates becomes zero. It may also be defined as the set of all points that lie on their dual hyperplanes, under some projective duality of the space.
lexicalization	eng: quadric
instance of	(noun) a curve or surface whose equation (in Cartesian coordinates) is of the second degree quadric, quadric surface