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arXiv · 2001.04419

Exact categories, big Cohen-Macaulay modules and finite representation type

Chrysostomos Psaroudakis·Wolfgang Rump
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Abstract

One of the first remarkable results in the representation theory of artin algebras, due to Auslander and Ringel-Tachikawa, is the characterization of when an artin algebra is representation-finite. In this paper, we investigate aspects of representation-finiteness in the general context of exact categories in the sense of Quillen. In this framework, we introduce "big objects" and prove an Auslander-type "splitting-big-objects" theorem. Our approach generalises and unifies the known results from the literature. As a further application of our methods, we extend the theorems of Auslander and Ringel-Tachikawa to arbitrary dimension, i.e. we characterise when a Cohen-Macaulay order over a complete regular local ring is of finite representation type.

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Chrysostomos Psaroudakis, Wolfgang Rump. 2020-01-13. Exact categories, big Cohen-Macaulay modules and finite representation type. https://arxiv.org/abs/2001.04419

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