Gives a simple description of the free abelian category to clarify Auslander-Gruson-Jensen duality between definable subcategories of right and left modules over a ring.
Elementary duality of modules
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Revising Auslander-Gruson-Jensen duality
Gives a simple description of the free abelian category to clarify Auslander-Gruson-Jensen duality between definable subcategories of right and left modules over a ring.