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Journal of Algebra
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Journal of Algebra
Article . 2000
License: Elsevier Non-Commercial
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Archiv der Mathematik
Article . 1996 . Peer-reviewed
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Journal of Algebra
Article . 2000 . Peer-reviewed
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zbMATH Open
Article . 1996
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An Artin problem for division ring extensions and the pure semisimplicity conjecture I

An Artin problem for division ring extensions and the pure semisimplicity conjecture. II
Authors: Simson, Daniel;

An Artin problem for division ring extensions and the pure semisimplicity conjecture I

Abstract

The author builds on his work in part I [Arch. Math. 66, No. 2, 114-122 (1996; Zbl 0873.16010)] which in turn extends ideas of \textit{P. M. Cohn} [Proc. Lond. Math. Soc., III. Ser. 11, 531-556 (1961; Zbl 0104.03301)] and \textit{A. H. Schofield} [Representation of rings over skew fields, Lond. Math. Soc. Lect. Note Ser. 92 (1985; Zbl 0571.16001)] in his efforts to find a counterexample to the pure semisimplicity conjecture (that a ring all of whose modules are direct sums of finitely generated modules must be of finite representation type). In order to produce a counterexample to this conjecture it would be enough to produce a pair \(F\subseteq G\) of division rings and an \((F,G)\)-bimodule \(M\) such that the dimensions of the modules obtained from \(M\) by successive application of the functors \(\text{Hom}_G(_F(-)_G,G)\) and \(\text{Hom}_F(_F(-)_G,F)\) form an infinite sequence belonging to a certain set that is defined in the paper. The author shows that there are very many, indeed uncountably many, sequences any one of which would, if realized, result in the triangular matrix ring, \(R_M\), formed from \(F\), \(G\) and \(M\) being a counterexample to the conjecture. The author also obtains detailed information on the structure of the module category of any such counterexample \(R_M\).

Keywords

Infinite-dimensional and general division rings, direct sums of finitely generated modules, Algebra and Number Theory, hereditary rings, module categories, division rings, Representation type (finite, tame, wild, etc.) of associative algebras, right pure semisimple rings, triangular matrix rings, Simple and semisimple modules, primitive rings and ideals in associative algebras, indecomposable right modules, pure semisimplicity conjecture, Representations of associative Artinian rings, finite representation type

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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!
27
Average
Top 10%
Average
hybrid