--- a/ProgTutorial/document/root.tex	Tue Aug 18 01:05:56 2009 +0200
+++ b/ProgTutorial/document/root.tex	Wed Aug 19 00:49:40 2009 +0200
@@ -69,9 +69,11 @@
 \MakeFramed {\advance\hsize-\width \FrameRestore}}%
 {\endMakeFramed}
 
-
 \newenvironment{readmore}%
 {\begin{leftrightbar}\small\it{\textbf{Read More}}\\}{\end{leftrightbar}}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% some mathematical notation
+\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % this is to draw a gray box around code