An isomorphism from a projective space to the dual of a projective space, often to the dual of itself.
A reciprocal, parallel or complementary relationship between two or more comparable objects.
One of the several measures of the linear statistical relationship between two random variables, indicating both the strength and direction of the relationship.
The act, or the result of making a mixture.
Of a stochastic process, to be asymptotically independent (in a precise mathematical sense).