--- a/slides/slides02.tex	Sun Sep 30 23:38:38 2018 +0100
+++ b/slides/slides02.tex	Mon Oct 01 01:11:42 2018 +0100
@@ -270,6 +270,19 @@
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{\begin{tabular}{c}\\[3cm]\huge\alert{Questions?}\end{tabular}}
+
+\bigskip
+homework (written exam 80\%)\\
+coursework (20\%; first one today)\\
+submission Fridays @ 18:00 -- accepted Mondays
+\mbox{}
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  
+
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
 \frametitle{Semantic Derivative\\[5mm]}
@@ -880,6 +893,45 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Negation of Regular Expr's}
+
+\begin{itemize}
+\item \bl{$\sim{}r$}  \hspace{6mm} (everything that \bl{$r$} cannot recognise)\medskip
+\item \bl{$L(\sim{}r) \dn UNIV - L(r)$}\medskip
+\item \bl{$nullable (\sim{}r) \dn not\, (nullable(r))$}\medskip
+\item \bl{$der\,c\,(\sim{}r) \dn \;\sim{}(der\,c\,r)$}
+\end{itemize}\bigskip\pause
+
+Used often for recognising comments:
+
+\[
+\bl{/ \cdot * \cdot (\sim{}([a\mbox{-}z]^* \cdot * \cdot / \cdot [a\mbox{-}z]^*)) \cdot * \cdot /}
+\]
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Coursework}
+
+\underline{Strand 1:}
+
+\begin{itemize}
+\item Submission on Friday 12 October\\accepted until Monday 15 @ 18:00\medskip
+\item source code needs to be submitted as well\medskip
+\item you can re-use my Scala code from KEATS \\
+  or use any programming language you like\medskip
+\item \small https://nms.kcl.ac.uk/christian.urban/ProgInScala2ed.pdf\normalsize
+\end{itemize}  
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+  
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
 \frametitle{Proofs about Rexps}