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About: Presheaf with transfers     Goto   Sponge   NotDistinct   Permalink

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In algebraic geometry, a presheaf with transfers is, roughly, a presheaf that, like cohomology theory, comes with pushforwards, “transfer” maps. Precisely, it is, by definition, a contravariant additive functor from the category of finite correspondences (defined below) to the category of abelian groups (in category theory, “presheaf” is another term for a contravariant functor). A presheaf F with transfers is said to be -homotopy invariant if for every X. For example, Chow groups as well as motivic cohomology groups form presheaves with transfers.