A localization is a universal functor from a given category with respect to the inversion of some family of morphisms in ; sometimes one says also quotient category. In topos theory and some other subjects one often restricts to the situation when is a calculus of left fractions, and the corresponding localization functor has a right adjoint (which is then necessarily fully faithful); even more, one often requires that the localization functor is also left exact, hence exact.
One may then speak of colocalization as the dual version of localization, a universal functor into a quotient category where now admits a calculus of right fractions and the corresponding quotient functor has a left adjoint. See also at right Bousfield localization.
The theory of colocalization in co-Grothendieck categories? has some features of its own as compared to the localization in Grothendieck categories. Namely, while by Gabriel-Popescu’s theorem, every Grothendieck category is a localization of a category of modules over a fixed unital ring, their dual categories may be presented in terms of the theory of linear topological rings with some compactness properties, which is the content of Gabriel-Oberst duality theory.
A textbook exposition is in the chapter 6, Duality of
In derived and triangulated categories:
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