
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 \(L(\widetilde\Lambda)/G\).
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
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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