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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 Acta Mathematica Hun...arrow_drop_down
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Acta Mathematica Hungarica
Article . 1983 . 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
zbMATH Open
Article . 1983
Data sources: zbMATH Open
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Upper radicals of regular classes

Authors: Leavitt, W. G.;

Upper radicals of regular classes

Abstract

In an earlier paper [\textit{W. G. Leavitt}, Stud. Sci. Math. Hung. 16, 15- 23 (1981; Zbl 0481.16002)] the author showed: if a class \({\mathbb{M}}\) of rings has property (E) the following are equivalent: (1) U\({\mathbb{M}}\) is hereditary. (2) Every \(0\neq R\in {\mathbb{M}}_ k\) has some image \(0\neq R/I\in SU{\mathbb{M}}.\) Here \(U{\mathbb{M}}=\{R| \quad every\quad 0\neq R/I\not\in {\mathbb{M}}\}\quad S{\mathbb{M}}=\{R| \quad I\not\in {\mathbb{M}}\quad for\quad every\quad ideal\quad I\quad in\quad R\}\) and \({\mathbb{M}}_ k=\{R| \quad I\) is an essential ideal of R for some \(I\in {\mathbb{M}}\}.\) In this paper it is shown that property (E) is rather independent of a regular class. An example is constructed of a regular class \({\mathbb{M}}\) with property (2) but for which U\({\mathbb{M}}\) is not hereditary. Replacing \({\mathbb{M}}_ k\) by \({\mathbb{M}}'\!_ k\), where \({\mathbb{M}}'\) is larger than \({\mathbb{M}}\), gives the result: Let \({\mathbb{M}}\) be a regular class. The following are equivalent: (1) U\({\mathbb{M}}\) is hereditary. (2) Every \(0\neq R\in {\mathbb{M}}'\!_ k\) has an image \(0\neq R/I\in SU{\mathbb{M}}.\) By an ingenious construction the author is able to construct a regular class \({\mathbb{M}}\) which does not have (E), but for which U\({\mathbb{M}}\) is hereditary. This example gives a negative answer to a question posed by the author in his cited paper.

Related Organizations
Keywords

regular class, Radicals and radical properties of associative rings, Torsion theories; radicals on module categories (associative algebraic aspects), hereditary

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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!
3
Average
Top 10%
Average
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