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

preprint2022arXivOpen access

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.

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