Slogan by Herman Rohrbach and jojo

http://stacks.math.columbia.edu/tag/046W#comment-1366 http://stacks.math.columbia.edu/tag/046W#comment-1371
stacks · Apr 1, 2015 · 6c9caf3 · 6c9caf3
1 parent da2dde4
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diff --git a/algebra.tex b/algebra.tex
@@ -9794,6 +9794,9 @@ \section{Perfect fields}
 
 \begin{lemma}
 \label{lemma-perfection}
+\begin{reference}
+Every field has a unique perfect closure.
+\end{reference}
 For every field $k$ there exists a purely inseparable extension
 $k \subset k'$ such that $k'$ is perfect. The field extension
 $k \subset k'$ is unique up to unique isomorphism.