Definition:Exact Chain Complex
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Definition
Let $\AA$ be an abelian category.
Let $\family {d_i : C_i \to C_{i - 1} }_{i \mathop \in \Z}$ be a chain complex in $\AA$.
Then $\family {d_i : C_i \to C_{i - 1} }_{i \mathop \in \Z}$ is exact if and only if it is exact at $C_i$ for all $i \mathop \in \Z$.
Also see
Sources
- 1994: Charles Weibel: An Introduction to Homological Algebra: $\S 1.1$.