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--- a/handouts/ho02.tex	Wed Sep 27 21:29:25 2017 +0100
+++ b/handouts/ho02.tex	Thu Sep 28 11:04:11 2017 +0100
@@ -23,7 +23,7 @@
 match the strings).  To see the substantial differences in the left
 and right plots below, note the different scales of the $x$-axes.
 
-
+  
 \begin{center}
 Graphs: $(a^*)^* \cdot b$ and strings $\underbrace{a\ldots a}_{n}$
 \begin{tabular}{@{}cc@{}}
@@ -282,7 +282,7 @@
 that they hold. As an aside, there has been a lot of research about
 questions like: Can one always decide when two regular expressions are
 equivalent or not? What does an algorithm look like to decide this
-efficiently?
+efficiently? So in general it is not a trivial problem.
 
 \subsection*{The Matching Algorithm}
 
@@ -726,7 +726,7 @@
 \end{center}
 
 \noindent
-To reacap, Python and Ruby needed approximately 30 seconds to match a
+To recap, Python and Ruby needed approximately 30 seconds to match a
 string of 28 \texttt{a}s and the regular expression $a^{?\{n\}} \cdot
 a^{\{n\}}$.  We need a third of this time to do the same with strings
 up to 11,000 \texttt{a}s.  Similarly, Java and Python needed 30
@@ -774,7 +774,7 @@
 but it seems it is a combination of the clauses for \texttt{ALT}
 and \texttt{SEQ}. In the latter case we call \texttt{der} with 
 a single character and this potentially produces an alternative.
-The derivative of such an alternative can then be more effeciently  
+The derivative of such an alternative can then be more efficiently  
 calculated by \texttt{ders2} since it pushes a whole string
 under an \texttt{ALT}. The numbers are that in the second case  
 $(a^*)^* \cdot b$ both versions are pretty much the same, but in the 
@@ -1046,7 +1046,7 @@
 recipes} is already a big step in actually performing these proofs.
 If you do not believe it, proofs have helped me to make sure my code
 is correct and in several instances prevented me of letting slip
-embarassing mistakes into the `wild'.
+embarrassing mistakes into the `wild'.
 
 \end{document}
 

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--- a/slides/slides01.tex	Wed Sep 27 21:29:25 2017 +0100
+++ b/slides/slides01.tex	Thu Sep 28 11:04:11 2017 +0100
@@ -6,9 +6,6 @@
 
 \hfuzz=220pt 
 
-%\setmonofont[Scale=.88]{Consolas}
-%\newfontfamily{\consolas}{Consolas}
-
 \lstset{language=Scala,
         style=mystyle,
         numbersep=0pt,
@@ -25,7 +22,7 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
-\frametitle{%
+\frametitle{%  
   \begin{tabular}{@ {}c@ {}}
   \\[-3mm]
   \LARGE Compilers and \\[-1mm] 
@@ -38,7 +35,7 @@
   %\footnotesize\textcolor{gray}{Antikythera automaton, 100 BC (Archimedes?)}
   \end{center}
 
-\normalsize
+  \normalsize
   \begin{center}
   \begin{tabular}{ll}
   Email:  & christian.urban at kcl.ac.uk\\
@@ -47,7 +44,6 @@
   \end{tabular}
   \end{center}
 
-
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
@@ -266,11 +262,10 @@
 \small\centering
 matching \texttt{[a?]\{n\}[a]\{n\}} and \texttt{[a*]*b}
 against $\underbrace{\texttt{a}...\texttt{a}}_n$
-\end{frame}
+\end{frame} 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  
 
 
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
 \frametitle{Lectures 1 - 5}

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--- a/slides/slides02.tex	Wed Sep 27 21:29:25 2017 +0100
+++ b/slides/slides02.tex	Thu Sep 28 11:04:11 2017 +0100
@@ -1122,7 +1122,7 @@
 \lstinputlisting[numbers=none]{../progs/app52.scala}
 \end{bubble}
 \end{textblock}} 
-
+ 
 
 \end{frame}
 

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