Abstract
We introduce n-abelian and n-exact categories, these are analogs of abelian and exact categories from the point of view of higher homological algebra. We show that n-cluster-tilting subcategories of abelian (resp. exact) categories are n-abelian (resp. n-exact). These results allow to construct several examples of n-abelian and n-exact categories. Conversely, we prove that n-abelian categories satisfying certain mild assumptions can be realized as n-cluster-tilting subcategories of abelian categories. In analogy with a classical result of Happel, we show that the stable category of a Frobenius n-exact category has a natural \((n+2)\)-angulated structure in the sense of Geiß–Keller–Oppermann. We give several examples of n-abelian and n-exact categories which have appeared in representation theory, commutative algebra, commutative and non-commutative algebraic geometry.
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The author wishes to thank Erik Darpö, Laurent Demonet, Martin Herschend, Martin Kalck, Julian Külshammer, Boris Lerner, Yann Palu and Pierre-Guy Plamondon for motivating conversations regarding the contents of this article. This acknowledgment is extended to Prof. Osamu Iyama for his encouragement, helpful and interesting discussions, his comments on previous versions of this article, and especially for his generosity in sharing his ideas regarding a first definition of n-abelian category. Finally, the author wishes to express his sincere thanks to the anonymous referee for her/his detailed comments on a previous version of this article; in particular, for pointing out an error in earlier formulations of Theorem 3.20 and Lemma 3.22.
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Jasso, G. n-Abelian and n-exact categories. Math. Z. 283, 703–759 (2016). https://doi.org/10.1007/s00209-016-1619-8
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DOI: https://doi.org/10.1007/s00209-016-1619-8
Keywords
- Abelian category
- Exact category
- Triangulated category
- n-Angulated category
- Homological algebra
- Cluster-tilting