Update Discrete_Mathematics_List.html

Author: toprise

Math/Discrete Mathematics/Discrete_Mathematics_List.html

@@ -51,6 +51,7 @@
         <br>
         <ul>
             <a href="One_About_Discrete_Mathematics.html"><li>1. About Discrete Mathematics</li></a>
+            <a href="javascript:history.back(-1)"><li>Back to the Previous Page</li></a>
         </ul>
     </body>
 </html>