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Auslander–Reiten Triangles and a Theorem of Zimmermann
Author(s) -
Krause Henning
Publication year - 2005
Publication title -
bulletin of the london mathematical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.396
H-Index - 48
eISSN - 1469-2120
pISSN - 0024-6093
DOI - 10.1112/s0024609304004011
Subject(s) - mathematics , functor , pure mathematics , mathematics subject classification , relation (database) , finitely generated abelian group , ring (chemistry) , discrete mathematics , chemistry , organic chemistry , database , computer science
A classical theorem of Zimmermann describes the relation between almost split sequences in the category of finitely presented modules and those in the category of all modules over some fixed ring. An analogue of Auslander–Reiten triangles in triangulated categories is proved in this paper. This is used to explain the relation between different existence results for Auslander–Reiten triangles, which are based either on Brown's representability theorem, or on the existence of Serre functors. 2000 Mathematics Subject Classification 18E30, 16G70 (primary), 14F05, 55U35 (secondary).