Lemma 18.34.6. Let \mathcal{C} be a site. Let \mathcal{O}_1 \to \mathcal{O}_2 be a homomorphism of sheaves of rings. Let \mathcal{F} be a sheaf of \mathcal{O}_2-modules. There is a canonical short exact sequence
functorial in \mathcal{F} called the sequence of principal parts.
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