A short proof for Auslander’s defect formula
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[1] Maurice Auslander,et al. Representation Theory of Artin Algebras: Notation , 1995 .
[2] I. Reiten,et al. Representation theory of artin algebras iii almost split sequences , 1975 .
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[1] Maurice Auslander,et al. Representation Theory of Artin Algebras: Notation , 1995 .
[2] I. Reiten,et al. Representation theory of artin algebras iii almost split sequences , 1975 .