Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4588052 | Journal of Algebra | 2008 | 46 Pages |
Abstract
Let G be a right module over a ring R and let QG denote the semi-primary classical right ring of quotients of EndR(G). Modules G and H are margimorphic if there are maps a:G→H and b:H→G such that ab and ba are regular elements in the respective endomorphism rings. The module H is called a marginal summand of G if G is margimorphic to H⊕H′ for some module H′. We study the existence and uniqueness of marginal summands of Gn for integers n>0 in terms of finitely generated projective right QG-modules. Some of these results extend to direct summands of Gn for integers n>0.
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