(also nonabelian homological algebra)
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For any two full subcategories and of an abelian category , define their Gabriel product as the full subcategory of generated by all objects such that fits in a short exact sequence of the form
where is an object in and is an object in .
In the case of the abelian category of modules over a ring, the Gabriel multiplication is sometimes expressed as Gabriel composition of filters of ideals, rather than in terms of abelian subcategories.
An analogous notion in the triangulated setup is the Verdier product.
When restricted to the class of topologizing subcategories, Gabriel multiplication is associative; if is small then the topologizing subcategories make a semiring with respect to the commutative operation and Gabriel multiplication; in particular is left and right distributive with respect to intersection of topologizing subcategories.
Last revised on October 7, 2022 at 16:04:53. See the history of this page for a list of all contributions to it.