The image of the derived category in the cluster category

Details The image of the derived category in the cluster category The image of the derived category in the cluster category

2010-10-06

arxiv.org/abs/1010.1129v1

Mathematics

Representation Theory

21 pages

Scientific paper

Cluster categories of hereditary algebras have been introduced as orbit categories of their derived categories. Keller has pointed out that for non-hereditary algebras orbit categories need not be triangulated, and he introduced the notion of triangulated hull to overcome this problem. In this paper we study the image if the natural functor from the bounded derived category to the cluster category, that is we investigate how far the orbit category is from being the cluster category. We show that for wide classes of non-piecewise hereditary algebras the orbit category is never equal to the cluster category.

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