Covariance and contravariance
From Wikipedia, the free encyclopedia
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
[edit] See also
- Covariance, in probability theory and statistics, the measure of how much two random variables vary together
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