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  • Induced and coinduced modul...
    Schiffler, Ralf; Serhiyenko, Khrystyna

    Journal of algebra, 02/2017, Volume: 472
    Journal Article

    We propose a new approach to study the relation between the module categories of a tilted algebra C and the corresponding cluster-tilted algebra B=C⋉E. This new approach consists of using the induction functor −⊗CB as well as the coinduction functor D(B⊗CD−). We show that DE is a partial tilting and a τ-rigid C-module and that the induced module DE⊗CB is a partial tilting and a τ-rigid B-module. Furthermore, if C=EndAT for a tilting module T over a hereditary algebra A, we compare the induction and coinduction functors to the Buan–Marsh–Reiten functor HomCA(T,−) from the cluster-category of A to the module category of B. We also study the question as to which B-modules are actually induced or coinduced from a module over a tilted algebra.