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Covariant vs Contrasveriant - What's the difference?

covariant | contrasveriant |

covariant

English

Adjective

(-)
  • (category theory) (Of a functor) which preserves composition
  • (computing, programming) Using or relating to covariance.
  • Noun

    (en noun)
  • A bihomogeneous polynomial in x'', ''y'', ... and the coefficients of some homogeneous form in ''x'', ''y , ... that is invariant under some group of linear transformations.
  • The variety defined by a covariant.