Transitivity and full transitivity for p-local modules |
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Authors: | G Hennecke L Strüngmann |
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Institution: | 1.Fachbereich 6, Mathematik, Universit?t Essen, 45117 Essen, Germany,DE |
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Abstract: | A p-local module M is called (fully) transitive if for all x,y ? Mx,y\in M with UM(x) = UM(y) ( UM(x)\leqq UM(y)U_M(x)\leqq U_M(y)) there exists an automorphism (endomorphism) of M which maps x onto y. In this paper we examine the relationship of these two notions in the case of p-local modules. We show that a module M is fully transitive if and only if M?MM\oplus M is transitive in the case where the divisible part of M/tMM/tM has rank at most one. Moreover, we show that for the same class of modules transitivity implies full transitivity if p > 2. This extends theorems of Files, Goldsmith and of Kaplansky for torsion p-local modules. |
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