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Commentarii Mathematici Helvetici
Article . 1994 . Peer-reviewed
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Lie algebras and coverings

Authors: Riedtmann, Christine;

Lie algebras and coverings

Abstract

Let \(\Lambda\) be an associative unitary finite-dimensional \(\mathbb{C}\)-algebra which is representation finite. This means that the number of isomorphism classes of indecomposable finite-dimensional \(\Lambda\)-left modules is finite. Let us fix a set \(\mathcal F\) of representatives for these isomorphism classes. We showed [\textit{C. Riedtmann}, J. Algebra 170, No. 2, 526-546 (1994; Zbl 0841.16018)] that the free \(\mathbb{Z}\)-module \(L(\Lambda)=\bigoplus_{A\in{\mathcal F}}\mathbb{Z} v_A\) generated by the symbols \(\{v_A:A\in{\mathcal F}\}\) can be made into a \(\mathbb{Z}\)-Lie algebra. This is the complex version of \textit{C. M. Ringel}'s construction of Lie algebras via Hall algebras over finite fields [Banach Center Publ. 26, 433-447 (1990; Zbl 0778.16004)]. The construction of \(L(\Lambda)\) carries over easily to the case where \(\Lambda\) is a locally representation finite \(\mathbb{C}\)-category. Theorem. Let \(\Lambda\) be a locally representation finite \(\mathbb{C}\)-category with universal cover \(\widetilde\Lambda\) and fundamental group \(G\). Then \(L(\Lambda)\) is isomorphic to \(L(\widetilde\Lambda)/G\).

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Keywords

finite-dimensional algebras, representation finite algebras, Article, Representation type (finite, tame, wild, etc.) of associative algebras, indecomposable finite-dimensional left modules, locally representation finite categories, 510.mathematics, universal covers, Lie algebras, Hall algebras over finite fields, Structure theory for Lie algebras and superalgebras, Representations of associative Artinian rings, fundamental groups

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citations
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!
7
Average
Top 10%
Average
Green
gold