Klein quadric
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A Klein Quadratic set is defined as a hyperbolic quadratic set of a five dimensional projective space.
[edit] Basic Geometrical Definitions
Let C and C' be equivalence classes of planes of a Klein Quadratic set Q in 5d projective space P, the geometry G is as follows.
1. The points of G are the planes of C.
2. The lines of G are the points of Q.
3. The planes of G are the planes of C'