Representations in Abelian Categories
Representations in Abelian Categories
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DOI:
10.1007/978-3-642-99902-4_4
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发表时间:
1966
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影响因子:
--
通讯作者:
P. Freyd
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文献类型:
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作者:
P. Freyd
Consider the general but imprecise question: given a category how nicely can it be represented in an abelian category 1 Without the" nicely" qualification the question evaporates. Any small category can be embedded in an abelian category and any small+'ive category can be fully embedded, namely via the representation functor d~(d*,~),(Abelian Oategories 5. 35).If d is an exact category, that is an Eij'ive category together with a class of short exact sequences satisfying certain conditions, then there are very nice embeddings into abelian categories: besides being full they both preserve and reflect exactness (ie preserve non-exactness).