Definitions from Wiktionary (contravariant)

▸ adjective:  (category theory, of a functor) Which reverses the order of morphism composition: formally, which associates each morphism f:X→Y to a morphism F(f):F(Y)→F(X).
▸ adjective:  (object-oriented programming) Using or relating to contravariance.
▸ adjective:  (linear algebra, of a vector) Scaling inversely with a change of basis.
▸ noun:  (algebra) A bihomogeneous polynomial in dual variables of x, y, ... and the coefficients of some homogeneous form in x, y, ... that is invariant under some group of linear transformations.




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