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A short proof for Auslander’s defect formula

By Henning Krause

Abstract

AbstractWe give a short proof of Auslander’s formula relating the covariant and the contravariant defect of a short exact sequence in a module category. An immediate consequence is the classical Auslander–Reiten formula relating Ext and Hom

Publisher: Elsevier Science Inc.
Year: 2003
DOI identifier: 10.1016/S0024-3795(02)00481-0
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