 Long exact sequence from a coefficient sequence

ID: long-exact-sequence-from-a-coefficient-sequence

0 \to A \to B \to C \to 0

induces a natural long exact sequence

\dots \to H^{i} (X; A) \to H^{i} (X; B) \to H^{i} (X; C) δ H^{i + 1} (X; A) \to \dots .

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