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math.RT2023★ 1 cited
On exact dg categories
Xiaofa Chen
We introduce the notion of an exact dg category, which is a simultaneous generalization of the notions of exact category in the sense of Quillen and of pretriangulated dg category…
math.RT2019
The lower extension groups and quotient categories
Xiaofa Chen, Xiao-Wu Chen
For a certain full additive subcategory X of an additive category A, one defines the lower extension groups in relative homological algebra. We show that these groups are isomorphi…