English

The $Q$-shaped derived category of a ring -- compact and perfect objects

Representation Theory 2022-08-30 v1 Category Theory Rings and Algebras

Abstract

In a previous work we constructed the QQ-shaped derived category of any ring AA for any suitably nice category QQ. The QQ-shaped derived category of AA, which is denoted by DQ(A)\mathcal{D}_{Q}(A), is a generalization of the ordinary derived category. In this paper we prove that the QQ-shaped derived category of AA is a compactly generated triangulated category. We also define perfect objects in DQ(A)\mathcal{D}_{Q}(A) and prove that these constitute a triangulated subcategory, DQperf(A)\mathcal{D}^\mathrm{perf}_{Q}(A), of the category DQ(A)c\mathcal{D}_{Q}(A)^\mathrm{c} of compact objects in the QQ-shaped derived category. The subcategories DQperf(A)\mathcal{D}^\mathrm{perf}_{Q}(A) and DQ(A)c\mathcal{D}_{Q}(A)^\mathrm{c} coincide if and only if the former is thick.

Keywords

Cite

@article{arxiv.2208.13282,
  title  = {The $Q$-shaped derived category of a ring -- compact and perfect objects},
  author = {Henrik Holm and Peter Jorgensen},
  journal= {arXiv preprint arXiv:2208.13282},
  year   = {2022}
}

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27 pages