fix compilation

doc/nextml2015/presentation.tex

@@ -443,8 +443,8 @@ e = a + d
   \begin{itemize}
   \item This mean all slices, index selection return view:
     \begin{itemize}
-    \item a\_tensor[startstopstep, N] # return a view
-    \item a\_tensor[-1] # reverse the vector, return a view
+    \item a\_tensor[startstopstep, N] \# return a view
+    \item a\_tensor[-1] \# reverse the vector, return a view
     \end{itemize}
   \item Advanced indexing as NumPy:
     \begin{itemize}