Performed housekeeping for topological groups.

src/topology/uniform/definition.tex

@@ -25,7 +25,7 @@
 \label{definition:slice}
     Let $X, Y$ be sets, $U \subset X \times Y$, and $A \subset X$, then
     \[
-    U(A) = \bracs{y \in Y: (x, y) \in U, x \in A}
+    U(A) = \bracs{y \in Y| (x, y) \in U, x \in A}
     \]
 
     is the \textbf{slice} of $U$ at $A$.