Fix.

sections/problem-definition.tex

@@ -13,7 +13,7 @@
 
 		\note{
 			Let us start with some notation.
-			Assume that all data comes in atomic units called blocks and assume that we have $N$ distinct blocks in ORAM.
+			Assume that all data comes in atomic units called blocks and assume that we have $N$ distinct blocks in ORAM\@.
 		}
 	\end{frame}