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Signed-off-by: Marcello Seri <marcello.seri@gmail.com>
mseri · Nov 6, 2023 · 626dbea · 626dbea
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diff --git a/1-manifolds.tex b/1-manifolds.tex
@@ -140,7 +140,7 @@ \section{Topological manifolds}\label{sec:top_manifolds}
   More generally, any $n$-dimensional vector space\footnote{In fact, any open subset of a $n$-dimensional vector space.} is a topological $n$-manifold.
 \end{example}
 
-\begin{exercise}[The line with two origins]
+\begin{exercise}[The line with two origins]\label{exe:line-two-origins}
   Even though $\R^n$ with the euclidean topology is Hausdorff, being Hausdorff does not follow from being locally euclidean. A famous counterexample is the following\sidenote[][-2em]{See also \cite[Problem 1-1]{book:lee} and \cite[Problem 5.1]{book:tu}.}.
   \begin{marginfigure}
     \includegraphics{1_ex_1_0_11.pdf}