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Triangulated categories of periodic complexes and orbit categories

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Abstract

We investigate the triangulated hull of orbit categories of the perfect derived category and the bounded derived category of a ring concerning the power of the suspension functor. It turns out that the triangulated hull corresponds to the full subcategory of compact objects of certain triangulated categories of periodic complexes. This specializes to Stai and Zhao’s result on the finite dimensional algebra of finite global dimension. As the first application, if A, B are flat algebras over a commutative ring and they are derived equivalent, then the corresponding derived categories of n-periodic complexes are triangle equivalent. As the second application, we get the periodic version of the Koszul duality.

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Acknowledgements

Part of the work was done during the author’s visit to the University of Utah. The author would like to thank his advisors Xiao-Wu Chen and Srikanth Iyengar for their encouragement and discussions, and the China Scholarship Council for their financial support. Special thanks to Benjamin Briggs for providing a similar project related to Section 6 which makes the article possible. The author thanks Janina Letz and Josh Pollitz for their discussions on this work. The author also thanks anonymous referees for their helpful comments and suggestions.

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Correspondence to Jian Liu.

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Liu, J. Triangulated categories of periodic complexes and orbit categories. Czech Math J 73, 765–792 (2023). https://doi.org/10.21136/CMJ.2023.0234-22

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