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Localizing subcategory : ウィキペディア英語版
Localizing subcategory
In mathematics, Serre and localizing subcategories form important classes of subcategories of an abelian category. Localizing subcategories are certain Serre subcategories. They are strongly linked to the notion of a quotient category.
== Serre subcategories ==

Let \mathcal be an abelian category. A non-empty
full subcategory \mathcal is called a ''Serre subcategory'' (or also a ''dense subcategory''), if for every short exact sequence 0\rightarrow
A' \rightarrow A\rightarrow A''\rightarrow 0 in
\mathcal the object A is in
\mathcal if and only if the objects A'
and A'' belong to \mathcal. In words:
\mathcal is closed under subobjects, quotient objects
and extensions.
The importance of this notion stems from the fact that kernels of
exact functors between abelian categories have this property, and that
one can build (for locally small \mathcal) the quotient category (in the sense of Gabriel, Grothendieck,
Serre) \mathcal/\mathcal, which
has the same objects as \mathcal, is abelian, and
comes with an exact functor (called the quotient functor)
T\colon\mathcal\rightarrow\mathcal/\mathcal
whose kernel is \mathcal.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Localizing subcategory」の詳細全文を読む



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