Lemma 47.5.8 (08Y9)—The Stacks project

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Part 3: Topics in Scheme Theory
Chapter 47: Dualizing Complexes
Section 47.5: Injective hulls
Lemma 47.5.8 (cite)

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Lemma 47.5.8. Let $R$ be a Noetherian ring. Let $E$ be an indecomposable injective $R$ -module. Then there exists a prime ideal $\mathfrak p$ of $R$ such that $E$ is the injective hull of $\kappa (\mathfrak p)$ .

Proof. Let $\mathfrak p$ be the prime ideal found in Lemma 47.5.6. Say $\mathfrak p = (f_1, \ldots , f_ r)$ . Pick a nonzero element $x \in \bigcap \mathop{\mathrm{Ker}}(f_ i : E \to E)$ , see Lemma 47.5.6. Then $(R_\mathfrak p)x$ is a module isomorphic to $\kappa (\mathfrak p)$ inside $E$ . We conclude by Lemma 47.5.6. $\square$

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