Definition 37.5.1. Let $i : Z \to X$ be an immersion of schemes. The first order infinitesimal neighbourhood of $Z$ in $X$ is the first order thickening $Z \subset Z'$ over $X$ described above.
Definition 37.5.1. Let $i : Z \to X$ be an immersion of schemes. The first order infinitesimal neighbourhood of $Z$ in $X$ is the first order thickening $Z \subset Z'$ over $X$ described above.
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