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A family of noetherian rings with their finite length modules under control
Authors:Markus Schmidmeier
Institution:(1) Dept. of Math. Sciences, Florida Atlantic University, Boca Raton, Florida, 33431-0991, U.S.A
Abstract:We investigate the category modLambda of finite length modules over the ring Lambda=A otimes k Sgr, where Sgr is a V-ring, i.e. a ring for which every simple module is injective, k a subfield of its centre and A an elementary k-algebra. Each simple module E j gives rise to a quasiprogenerator P j = A otimes E j . By a result of K. Fuller, P j induces a category equivalence from which we deduce that modLambda sime coprodj mod EndP j . As a consequence we can(1) construct for each elementary k-algebra A over a finite field k a nonartinian noetherian ring Lambda such that modA sime modLambda(2) find twisted versions Lambda of algebras of wild representation type such that Lambda itself is of finite or tame representation type (in mod)(3) describe for certain rings Lambda the minimal almost split morphisms in modLambda and observe that almost all of these maps are not almost split in ModLambda.
Keywords:V-ring  progenerator  almost split morphisms
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