## Tag `033M`

Chapter 27: Properties of Schemes > Section 27.7: Normal schemes

Lemma 27.7.6. Let $X$ be a Noetherian scheme. The following are equivalent:

- $X$ is normal, and
- $X$ is a finite disjoint union of normal integral schemes.

Proof.This is a special case of Lemma 27.7.5 because a Noetherian scheme has a Noetherian underlying topological space (Lemma 27.5.5 and Topology, Lemma 5.9.2. $\square$

The code snippet corresponding to this tag is a part of the file `properties.tex` and is located in lines 841–849 (see updates for more information).

```
\begin{lemma}
\label{lemma-normal-Noetherian}
Let $X$ be a Noetherian scheme.
The following are equivalent:
\begin{enumerate}
\item $X$ is normal, and
\item $X$ is a finite disjoint union of normal integral schemes.
\end{enumerate}
\end{lemma}
\begin{proof}
This is a special case of
Lemma \ref{lemma-normal-locally-finite-nr-irreducibles} because a Noetherian
scheme has a Noetherian underlying topological space
(Lemma \ref{lemma-Noetherian-topology}
and
Topology, Lemma \ref{topology-lemma-Noetherian}.
\end{proof}
```

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