The formulation of a general hypothesis which seeks to connect two or more facts.
A binding together.
The co-occurrence of syntactic categories, usually within a sentence.
One of the several measures of the linear statistical relationship between two random variables, indicating both the strength and direction of the relationship.
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.