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.
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