Mathematics – Representation Theory
Scientific paper
2011-10-31
Mathematics
Representation Theory
The paper has been revised and expanded. The terminology has been changed as follows: "essential kernel" is replaced by "intri
Scientific paper
We deal with finitely generated modules over an artin algebra. In his Philadelphia Notes, M.Auslander showed that any homomorphism is right determined by a module C, but a formula for C which he wrote down has to be modified. The paper includes now complete and direct proofs of the main results concerning right determiners of morphisms. We discuss the role of indecomposable projective direct summands of a minimal right determiner and provide a detailed analysis of those morphisms which are right determined by a module without any non-zero projective direct summand.
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