principle of duality

principle of duality : In mathematics projective geometry is the study of geometric properties which are invariant under projective transformations. The field of projective geometry is itself divided into many subfields, two examples of which are projective algebraic geometry (the study of projective varieties) and..   More from Wikipedia

principle of duality : 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. More formally,..   More from Wikipedia

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