fixed some typesetting problems

inputs/lecture_26.tex

@@ -83,13 +83,10 @@ We do a second proof of \yaref{thm:hindman}:
             \footnote{Note that here we might need to choose
                 a bigger $N$ than the $M$ in \yaref{def:unifrec},
                 but $2M$ suffices.}%
-            \[
-            \forall n.~\exists N% \gg n
-            .~\forall r.~(y(r), y(r+1), \ldots, y(r+N - 1)
-            \text{ contains }
-            (y(0), y(1), \ldots, y(n))
-            \text{ as a subsequence.}
-            \]
+            \begin{IEEEeqnarray*}{rl}
+                \forall n.~\exists N.~\forall r.~&(y(r), y(r+1), \ldots, y(r+N - 1)\\
+                                                 &\text{ contains } (y(0), y(1), \ldots, y(n)) \text{ as a subsequence.}\\
+            \end{IEEEeqnarray*}
     \end{itemize}
 
     Consider $y(0)$.