small changes

inputs/tutorial_09.tex

@@ -14,9 +14,10 @@
 
 \subsection{Sheet 8}
 
-Material on topological dynamic
+Material on topological dynamics:
 \begin{itemize}
-    \item Terence Tao's notes on ergodic theory 254 A.
+    \item Terence Tao's notes on ergodic theory 254A:
+        \url{https://terrytao.wordpress.com/category/teaching/254a-ergodic-theory/}
     \item Furstenberg (uses very different notation!).
 \end{itemize}
 
@@ -148,7 +149,7 @@ amounts to a finite number of conditions on the preimage.
             \iff&\exists x \in X.~\forall U \overset{\text{open}}{\subseteq} X.~
             \exists z \in \Z.~f^z(x) \in U.
         \end{IEEEeqnarray*}
-    \item Not solved.
+    \item \todo{TODO}
     \item It suffices to check the condition from part (b)
         for open sets $U$ of a countable basis
         and points  $x \in X$ belonging to a countable dense subset.
@@ -156,4 +157,3 @@ amounts to a finite number of conditions on the preimage.
         gives that $D$ is Borel.
 \end{itemize}
 
-