Lemma 92.25.1 (08V9)—The Stacks project

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Table of contents
Part 6: Deformation Theory
Chapter 92: The Cotangent Complex
Section 92.25: The cotangent complex of a scheme over a ring
Lemma 92.25.1 (cite)

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Lemma 92.25.1. In the situation above the category $\mathcal{C}_{X/\Lambda }$ is fibred over $X_{Zar}$ .

Proof. Given an object $U \to \mathbf{A}$ of $\mathcal{C}_{X/\Lambda }$ and a morphism $U' \to U$ of $X_{Zar}$ consider the object $U' \to \mathbf{A}$ of $\mathcal{C}_{X/\Lambda }$ where $U' \to \mathbf{A}$ is the composition of $U \to \mathbf{A}$ and $U' \to U$ . The morphism $(U' \to \mathbf{A}) \to (U \to \mathbf{A})$ of $\mathcal{C}_{X/\Lambda }$ is strongly cartesian over $X_{Zar}$ . $\square$

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