Definition 12.22.3. For a differential object $(A, d)$ we denote

\[ H(A, d) = \mathop{\mathrm{Ker}}(d)/\mathop{\mathrm{Im}}(d) \]

its *homology*.

Definition 12.22.3. For a differential object $(A, d)$ we denote

\[ H(A, d) = \mathop{\mathrm{Ker}}(d)/\mathop{\mathrm{Im}}(d) \]

its *homology*.

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