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The Stacks project

Lemma 29.32.18. Let

\xymatrix{ Z \ar[r]_ i \ar[rd]_ j & X \ar[d] \\ & Y }

be a commutative diagram of schemes where i and j are immersions. Then there is a canonical exact sequence

\mathcal{C}_{Z/Y} \to \mathcal{C}_{Z/X} \to i^*\Omega _{X/Y} \to 0

where the first arrow comes from Lemma 29.31.3 and the second from Lemma 29.32.15.

Proof. The algebraic version of this is Algebra, Lemma 10.134.7. \square


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