Covariance and contravariance describe how vector and covector components transform when a basis changes.
A covariant tensor is multilinear in vector arguments and transforms with one covariant index for each argument.
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Covariance and contravariance are concepts that primarily arise in the context of type theory, programming languages, and certain areas of mathematics, particularly when dealing with linear algebra and vector spaces. ### Covariance Covariance refers to a relationship where a change in one variable leads to a change in another variable in the same direction.
