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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Periodica Mathematic...arrow_drop_down
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Periodica Mathematica Hungarica
Article . 1996 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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On the module of homomorphisms into projective modules and multiplication modules

Authors: Naoum, Adil G.; Kider, Jihad R.;

On the module of homomorphisms into projective modules and multiplication modules

Abstract

Let \(A\) and \(B\) be modules over a commutative ring \(R\), and let \(\pi(A,B)\) denote the image of the evaluation map of \(\Hom (A,B) \otimes A\) into \(B\). Let \(T(A)\) denote \(\pi(A,R)\), the trace ideal of \(A\). The authors observe that \(\pi(A,B) =T(A) \cdot B\) whenever \(T(A) \cdot A=A\), in which case \(\pi(A,B)\) is a pure submodule of \(B\) if \(T(A)\) is a pure submodule of \(R\). The authors claim that the additional hypothesis of \(T(A)\) being a pure ideal is fulfilled when \(A\) is a projective module or \(A\) is a multiplication module, i.e. every submodule of \(A\) has the form \(I\cdot A\) for some ideal \(I\) of \(A\). A proof of the claim for multiplication modules will appear in a paper submitted for publication by the first author. Next let \(F(H)\) denote the image of the canonical homomorphism of \(\Hom (A,R) \otimes B\) into \(H= \Hom (A,B)\). If \(B\) is a projective module or a multiplication module with \(T(B) \cdot B=B\), the authors prove that the elements of \(F(H)\) are the homomorphisms \(f\) for which \(f(A)\) is contained in a finitely generated submodule of \(B\), \(F(H)\) is dense in \(H\), and \(F(H)\) is a pure submodule of \(H\). The proof for multiplication modules, theorem 2.8 of this paper, is marred by misprints and misstatements.

Keywords

Other special types of modules and ideals in commutative rings, evaluation map, trace ideal, Hom, pure submodule, multiplication modules, Morphisms of commutative rings, Divisibility and factorizations in commutative rings

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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