Fixed regex incident.

src/topology/main/quotient.tex

@@ -12,7 +12,7 @@
     \begin{enumerate}
         \item For any $U \subset Y$, $U$ is open if and only if $\pi^{-1}(U)$ is open.
         \item $\pi \in C(X; Y)$, and for any $U \subset X$ saturated and open, $\pi(U)$ is open.
-    \end\{enumerate\}
+    \end{enumerate}
 
     If the above holds, then $\pi$ is a \textbf{quotient map}.
 \end{definition}
@@ -38,7 +38,7 @@
         \]
 
         \item $\pi$ is a quotient map.
-    \end\{enumerate\}
+    \end{enumerate}
 
     The space $(\td X, \pi)$ is the \textbf{quotient} of $X$ by $\sim$.
 \end{definition}