Abstract
In this paper, we study selfinjective Koszul algebras of finite complexity. We prove that the complexity is a nonnegative integer when it is finite; and that the category
of modules with complexity less or equal to t, is resolving and coresolving. We show that for each 0 ≤ l ≤ m there exist a family of modules of complexity l parameterized by G(l,m), the Grassmannian of l-dimensional subspaces of an m-dimensional vector space V, for the exterior algebra of V. Using complexity, we also give a new approach to the representation theory of a tame symmetric algebra with vanishing radical cube over an algebraically closed field of characteristic 0, via skew group algebra of a finite subgroup of SL(2, C) over the exterior algebra of a 2-dimensional vector space.
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Supported by NSFC #10671061, SRFDP #200505042004 and the Cultivation Fund of the Key Scientific and Technical Innovation Project #21000115 of the Ministry of Education of China
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Guo, J.Y., Li, A.H. & Wu, Q.X. Selfinjective Koszul algebras of finite complexity. Acta. Math. Sin.-English Ser. 25, 2179–2198 (2009). https://doi.org/10.1007/s10114-009-6703-0
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DOI: https://doi.org/10.1007/s10114-009-6703-0