Covariance and contravariance

Covariance and contravariance may refer to:

Covariance and contravariance of vectors, in mathematics and theoretical physics
Covariance and contravariance of functors, in category theory
Covariance and contravariance (computer science), whether a type system preserves the ordering ≤ of types

Look up covariance or contravariance in Wiktionary, the free dictionary.

See also

Covariance, in probability theory and statistics, the measure of how much two random variables vary together
Covariance (disambiguation)

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