Key Words: Grothendieck category, irreducible subobject, completely irreducible subobject, coirreducible (uniform) object, irredu- cible decomposition, injective hull, Gabriel dimension, hereditary torsion theory,-irreducible submodule,
-completely irreducible submodule,
-coireducible module, module rich in
-coirreducibles.
2000 Mathematics Subject Classification: Primary: 16S90, 18E15;
Secondary: 18E40.
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