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Full Subcategory




A full subcategory ''S'' of a category ''C'' is a subcategory of ''C'' such that for each objects ''A'' and ''B'' of ''S'',

:\mathrm{Hom}_S(A,B)=\mathrm{Hom}_C(A,B)

The natural Functor from ''S'' of ''C'' that acts as the identity on objects and arrows is called the inclusion functor. It is always a Faithful Functor . The inclusion functor is Full if and only if ''S'' is a full subcategory.

A Serre subcategory is a non-empty full subcategory ''S'' of an Abelian Category ''C'' such that for all short Exact Sequence s

:0 o M' o M o M'' o 0

in ''C'', ''M'' belongs to ''S'' if and only if both M' and M'' do. This notion arises from Serre 's C-theory .


SEE ALSO