Update T4.tex

Tutorials/T04-A2Example/slides/T4.tex

@@ -135,6 +135,7 @@ McMaster University\\ }
                                        \item Specifices externally observable behaviour of a module
 			\item Not in language of implementation, uses mathematical language
 			\item Implementation details are not included in the MIS
+			\item MIS uses mathematical language for its preciseness, which means that it is helpful to learn discrete math from the last tutorial
 	 \end{itemize}
              
 \end{frame}