C should be B

Thanks to Fred Rohrer http://stacks.math.columbia.edu/tag/010J#comment-2376
stacks · Feb 17, 2017 · 892db41 · 892db41
1 parent d520c74
commit 892db41
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/homology.tex b/homology.tex
@@ -1033,7 +1033,7 @@ \section{Extensions}
 \begin{definition}
 \label{definition-extension}
 Let $\mathcal{A}$ be an abelian category.
-Let $A, C \in \Ob(\mathcal{A})$.
+Let $A, B \in \Ob(\mathcal{A})$.
 An {\it extension $E$ of $B$ by $A$} is a short
 exact sequence
 $$