Algebras and Representation Theory

, Volume 14, Issue 1, pp 57–74

Derived Equivalences of Triangular Matrix Rings Arising from Extensions of Tilting Modules

Authors

    • Einstein Institute of MathematicsThe Hebrew University of Jerusalem
    • Max-Planck-Institut für Mathematik
Open AccessArticle

DOI: 10.1007/s10468-009-9175-0

Cite this article as:
Ladkani, S. Algebr Represent Theor (2011) 14: 57. doi:10.1007/s10468-009-9175-0

Abstract

A triangular matrix ring Λ is defined by a triplet (R,S,M) where R and S are rings and R M S is an S-R-bimodule. In the main theorem of this paper we show that if T S is a tilting S-module, then under certain homological conditions on the S-module M S , one can extend T S to a tilting complex over Λ inducing a derived equivalence between Λ and another triangular matrix ring specified by (S′, R, M′), where the ring S′ and the R-S′-bimodule M′ depend only on M and T S , and S′ is derived equivalent to S. Note that no conditions on the ring R are needed. These conditions are satisfied when S is an Artin algebra of finite global dimension and M S is finitely generated. In this case, (S′,R,M′) = (S, R, DM) where D is the duality on the category of finitely generated S-modules. They are also satisfied when S is arbitrary, M S has a finite projective resolution and Ext S n (M S , S) = 0 for all n > 0. In this case, (S′,R,M′) = (S, R, Hom S (M, S)).

Keywords

Triangular matrix ring Derived equivalence Tilting complex

Mathematics Subject Classifications (2000)

18E30 16S50 18A25

Copyright information

© The Author(s) 2009