| author | Christian Urban <urbanc@in.tum.de> |
| Sat, 29 Dec 2018 10:30:27 +0000 | |
| changeset 617 | f7de0915fff2 |
| parent 616 | 24bbe4e4b37b |
| child 704 | 6d9c960a2b26 |
| permissions | -rw-r--r-- |
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\documentclass[dvipsnames,14pt,t]{beamer}
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\usepackage{../slides}
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\usepackage{../langs}
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\usepackage{../data}
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\usepackage{../graphics}
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\usepackage{soul}
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\tikzset{onslide/.code args={<#1>#2}{%
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\only<#1>{\pgfkeysalso{#2}} % \pgfkeysalso doesn't change the path
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}} |
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\makeatletter |
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\newenvironment<>{btHighlight}[1][]
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{\begin{onlyenv}#2\begingroup\tikzset{bt@Highlight@par/.style={#1}}\begin{lrbox}{\@tempboxa}}
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{\end{lrbox}\bt@HL@box[bt@Highlight@par]{\@tempboxa}\endgroup\end{onlyenv}}
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\newcommand<>\btHL[1][]{%
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\only#2{\begin{btHighlight}[#1]\bgroup\aftergroup\bt@HL@endenv}%
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} |
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\def\bt@HL@endenv{%
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\end{btHighlight}%
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\egroup |
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} |
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\newcommand{\bt@HL@box}[2][]{%
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\tikz[#1]{%
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\pgfpathrectangle{\pgfpoint{1pt}{0pt}}{\pgfpoint{\wd #2}{\ht #2}}%
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\pgfusepath{use as bounding box}%
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\node[anchor=base west, fill=orange!30,outer sep=0pt,inner xsep=1pt, inner ysep=0pt, rounded corners=3pt, minimum height=\ht\strutbox+1pt,#1]{\raisebox{1pt}{\strut}\strut\usebox{#2}};
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}% |
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} |
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\makeatother |
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% beamer stuff |
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\renewcommand{\slidecaption}{CFL 10, King's College London}
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\newcommand{\bl}[1]{\textcolor{blue}{#1}}
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\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[t]
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\frametitle{%
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\begin{tabular}{@ {}c@ {}}
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\\[-3mm] |
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\LARGE Compilers and \\[-2mm] |
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\LARGE Formal Languages (10)\\[3mm] |
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\end{tabular}}
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\normalsize |
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\begin{center}
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\begin{tabular}{ll}
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Email: & christian.urban at kcl.ac.uk\\ |
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Office: & N7.07 (North Wing, Bush House)\\ |
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Slides: & KEATS (also home work is there)\\ |
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\end{tabular}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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||
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\Large\bf Are there more strings in \bl{$L(a^*)$} or
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\bl{$L((a + b)^*)$}?
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\Large\bf There are more problems, than there are |
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programs.\bigskip\bigskip\pause\\ |
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There must be a problem for which there is no program. |
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Subsets}
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\Large |
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If \bl{$A \subseteq B$} then \bl{$A$} has fewer or equal elements
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than \bl{$B$}\bigskip\bigskip
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\Large |
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\bl{$A \subseteq B$} and \bl{$B \subseteq A$}\bigskip
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then \bl{$A = B$}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\begin{center}
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\begin{tikzpicture}
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\draw (-4,2.5) node [scale=2.5] (X) |
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{\begin{tabular}{l}
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$\{$
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\!\includegraphics[scale=0.02]{../pics/o1.jpg},
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\includegraphics[scale=0.02]{../pics/o2.jpg},
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\!\includegraphics[scale=0.02]{../pics/o3.jpg},
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\includegraphics[scale=0.02]{../pics/o4.jpg},
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\!\includegraphics[scale=0.027]{../pics/o5.jpg}
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$\}$ |
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\end{tabular}};
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\draw (-5.6,-2.5) node [scale=2.5] (Y) |
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{\begin{tabular}{l}
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$\{$
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\!\includegraphics[scale=0.059]{../pics/a1.jpg},
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\includegraphics[scale=0.048]{../pics/a2.jpg},
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\includegraphics[scale=0.02]{../pics/a3.jpg}
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$\}$ |
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\end{tabular}};
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\draw (0,1.5) node (X1) {5 elements};
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\draw (0,-3.5) node (y1) {3 elements};
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Newton vs Feynman}
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\begin{center}
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\begin{tabular}{cc}
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\includegraphics[scale=0.2]{../pics/newton.jpg} &
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\includegraphics[scale=0.2]{../pics/feynman.jpg}\\
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classical physics & quantum physics |
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\end{tabular}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{The Goal of the Talk}
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\large |
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\begin{itemize}
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\item show you that something very unintuitive happens with very large sets |
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\bigskip\bigskip |
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\item convince you that there are more {\bf problems} than {\bf programs}
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[t]
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% |
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\begin{center}
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\begin{tikzpicture}
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\draw (-5,2.5) node [scale=2.3] (X) |
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{\begin{tabular}{@ {\hspace{-3mm}}l}
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\bl{$B$ $=$ $\{$
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\!\includegraphics[scale=0.02]{../pics/o1.jpg},
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\includegraphics[scale=0.02]{../pics/o2.jpg},
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\!\includegraphics[scale=0.02]{../pics/o3.jpg},
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\includegraphics[scale=0.02]{../pics/o4.jpg},
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\!\includegraphics[scale=0.027]{../pics/o5.jpg}
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$\}$} |
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\end{tabular}};
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\draw (-6.6,-0.5) node [scale=2.3] (Y) |
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{\begin{tabular}{@ {\hspace{-3mm}}l}
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\bl{$A$ $=$ $\{$
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\!\includegraphics[scale=0.059]{../pics/a1.jpg},
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\includegraphics[scale=0.048]{../pics/a2.jpg},
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\includegraphics[scale=0.02]{../pics/a3.jpg}
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$\}$} |
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\end{tabular}};
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\only<1>{\draw (-5, -3) node[scale=2]
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{\bl{$|A|$ $=$ $5$}, \bl{$|B|$ $=$ $3$}};}
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\only<2>{
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\draw [->, line width=1mm, red] (-7.4, 0.2) -- (-6.1, 2.1); |
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\draw [->, line width=1mm, red] (-5.8, 0.2) -- (-3.1, 2.1); |
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\draw [->, line width=1mm, red] (-4.5, 0.2) -- (-7.6, 2.1); |
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\draw (-5, -3) node[scale=2] {then \bl{$|A|$ $\le$ $|B|$}};
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} |
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\only<3>{
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\draw [<-, line width=1mm, red] (-7.5, 0.2) -- (-6.1, 2.1); |
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\draw [<-, line width=1mm, red] (-7.3, 0.2) -- (-3.1, 2.1); |
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\draw [<-, line width=1mm, red] (-6, 0.2) -- (-7.5, 2.1); |
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\draw [<-, line width=1mm, red] (-4.5, 0.2) -- (-4.5, 2.1); |
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\draw [<-, line width=1mm, red] (-4.3, 0.2) -- (-1.3, 2.1); |
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\draw (-5, -3) node[scale=1.5] {\small{}for \bl{$=$}
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has to be a {\bf one-to-one} mapping};
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} |
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[c]
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\frametitle{Cardinality}
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\Large |
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\bl{$|A|$} $\dn$ ``how many elements''\bigskip\\
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\bl{$A \subseteq B \Rightarrow |A| \leq |B|$}\bigskip\\\pause
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if there is an injective function \bl{$f: A \rightarrow B$} then \bl{$|A| \leq |B|$}\
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\begin{center}
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\bl{\large$\forall x y.\; f(x) = f(y) \Rightarrow x = y$}
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\end{center}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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\begin{frame}[t]
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\begin{center}
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\begin{tikzpicture}
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\draw (-6.6,2.5) node [scale=2.3] (X) |
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{\begin{tabular}{@ {\hspace{-3mm}}l}
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$A$ $=$ $\{$
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\!\includegraphics[scale=0.02]{../pics/o1.jpg},
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\includegraphics[scale=0.02]{../pics/o2.jpg},
|
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\!\includegraphics[scale=0.02]{../pics/o3.jpg}
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$\}$ |
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\end{tabular}};
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\draw (-6.6,-0.5) node [scale=2.3] (Y) |
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{\begin{tabular}{@ {\hspace{-3mm}}l}
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$B$ $=$ $\{$
|
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\!\includegraphics[scale=0.059]{../pics/a1.jpg},
|
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\includegraphics[scale=0.048]{../pics/a2.jpg},
|
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\includegraphics[scale=0.02]{../pics/a3.jpg}
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$\}$ |
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\end{tabular}};
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\onslide<3->{\draw (-7, -3) node[scale=1.5]
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{then \bl{$|A|$ \alert{$=$} $|B|$}};}
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\only<1>{
|
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\draw [->, line width=1mm, red] (-7.4, 0.2) -- (-6.1, 2.1); |
|
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\draw [->, line width=1mm, red] (-5.8, 0.2) -- (-4.3, 2.1); |
|
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\draw [->, line width=1mm, red] (-4.5, 0.2) -- (-7.6, 2.1); |
|
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} |
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\only<2->{
|
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\draw [<-, line width=1mm, blue] (-7.5, 0.2) -- (-7.5, 2.1); |
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\draw [<-, line width=1mm, blue] (-5.8, 0.2) -- (-4.3, 2.1); |
|
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\draw [<-, line width=1mm, blue] (-4.5, 0.2) -- (-6.1, 2.1); |
|
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} |
|
263 |
||
264 |
||
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\end{tikzpicture}
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\end{center}
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||
268 |
\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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|
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470922b46a63
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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diff
changeset
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added
Christian Urban <christian dot urban at kcl dot ac dot uk>
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diff
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|
| 543 | 272 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
273 |
\begin{frame}[c]
|
|
274 |
\frametitle{Natural Numbers}
|
|
275 |
||
276 |
\Large |
|
277 |
\bl{$\mathbb{N}$} \bl{$\dn$} \bl{$\{0, 1, 2, 3, .......\}$}\bigskip\pause
|
|
278 |
||
279 |
\bl{$A$} is \alert{countable} iff \bl{$|A| \leq |\mathbb{N}|$}
|
|
280 |
||
281 |
\end{frame}
|
|
282 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
283 |
||
284 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
285 |
\begin{frame}[c]
|
|
286 |
\frametitle{First Question}
|
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287 |
||
288 |
\Large |
|
289 |
\bl{$|\mathbb{N} - \{0\}| \;\;\;\alert{?}\;\;\; |\mathbb{N}| $}\bigskip\bigskip
|
|
290 |
||
291 |
\large |
|
292 |
\bl{$\geq$} or \bl{$\leq$} or \bl{$=$} ?
|
|
293 |
\bigskip\bigskip\bigskip\pause |
|
294 |
||
295 |
\bl{$x$ $\mapsto$ $x + 1$},\\ \bl{$|\mathbb{N} - \{0\}|$ $=$
|
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296 |
$|\mathbb{N}|$}
|
|
297 |
\end{frame}
|
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298 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
299 |
||
300 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
301 |
\mode<presentation>{
|
|
302 |
\begin{frame}[c]
|
|
303 |
||
304 |
\Large |
|
305 |
\bl{$|\mathbb{N} - \{0, 1\}| \;\;\;\alert{?}\;\;\; |\mathbb{N}| $}\bigskip\pause
|
|
306 |
||
307 |
\bl{$|\mathbb{N} - \mathbb{O}| \;\;\;\alert{?}\;\;\; |\mathbb{N}| $}\bigskip\bigskip
|
|
308 |
||
309 |
\normalsize |
|
310 |
\bl{$\mathbb{O}$} $\dn$ odd numbers\quad \bl{$\{1,3,5......\}$}\\ \pause
|
|
311 |
\bl{$\mathbb{E}$} $\dn$ even numbers\quad \bl{$\{0,2,4......\}$}\\
|
|
312 |
\end{frame}}
|
|
313 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
314 |
||
315 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
316 |
\mode<presentation>{
|
|
317 |
\begin{frame}[c]
|
|
318 |
||
319 |
\Large |
|
320 |
\bl{$|\mathbb{N} \cup \mathbb{-N}| \;\;\;\alert{?}\;\;\; |\mathbb{N}| $}\bigskip\bigskip
|
|
321 |
||
322 |
||
323 |
\normalsize |
|
324 |
\bl{$\mathbb{\phantom{-}N}$} $\dn$ positive numbers\quad \bl{$\{0,1,2,3,......\}$}\\
|
|
325 |
\bl{$\mathbb{-N}$} $\dn$ negative numbers\quad \bl{$\{0,-1,-2,-3,......\}$}\\
|
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\end{frame}}
|
|
327 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
328 |
||
329 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
330 |
\mode<presentation>{
|
|
331 |
\begin{frame}[c]
|
|
332 |
||
333 |
\Large |
|
334 |
\bl{$A$} is \alert{countable} if there exists an injective \bl{$f : A \rightarrow \mathbb{N}$}\bigskip
|
|
335 |
||
336 |
\bl{$A$} is \alert{uncountable} if there does not exist an injective \bl{$f : A \rightarrow \mathbb{N}$}\bigskip\bigskip
|
|
337 |
||
338 |
||
339 |
countable: \bl{$|A| \leq |\mathbb{N}|$}\\
|
|
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uncountable: \bl{$|A| > |\mathbb{N}|$}\pause\bigskip
|
|
341 |
||
342 |
||
343 |
Does there exist such an \bl{$A$} ?
|
|
344 |
||
345 |
\end{frame}}
|
|
346 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
347 |
||
348 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
349 |
\mode<presentation>{
|
|
350 |
\begin{frame}[c]
|
|
351 |
\frametitle{Hilbert's Hotel}
|
|
352 |
||
353 |
\begin{center}
|
|
354 |
\includegraphics[scale=0.8]{../pics/hilberts_hotel.jpg}
|
|
355 |
\end{center}
|
|
356 |
||
357 |
\begin{itemize}
|
|
358 |
\item \ldots has as many rooms as there are natural numbers |
|
359 |
\end{itemize}
|
|
360 |
||
361 |
\end{frame}}
|
|
362 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
363 |
||
364 |
||
365 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
366 |
\begin{frame}[t]
|
|
367 |
\frametitle{\begin{tabular}{c}Real Numbers between\\[-2mm] 0 and 1\end{tabular}}
|
|
368 |
||
369 |
\begin{center}
|
|
370 |
\begin{tikzpicture}
|
|
371 |
\draw [fill, color=black!50] (1,4) rectangle (2, 3); |
|
372 |
\draw [fill, color=black!50] (2,3) rectangle (3, 2); |
|
373 |
\draw [fill, color=black!50] (3,2) rectangle (4, 1); |
|
374 |
\draw [fill, color=black!50] (4,1) rectangle (5, 0); |
|
375 |
\draw (0, 0) grid (8, 5); |
|
376 |
\draw [line width = 1.mm] (1,0) -- (1, 5); |
|
377 |
\draw [line width = 1.mm] (0, 4) -- (8, 4); |
|
378 |
\draw (0.5,3.5) node {$1$};
|
|
379 |
\draw (0.5,2.5) node {$2$};
|
|
380 |
\draw (0.5,1.5) node {$3$};
|
|
381 |
\draw (0.5,0.5) node {$4$};
|
|
382 |
||
383 |
\draw (1.5,3.5) node {\only<1>{$3$}\only<2->{$4$}};
|
|
384 |
\draw (2.5,3.5) node {$3$};
|
|
385 |
\draw (3.5,3.5) node {$3$};
|
|
386 |
\draw (4.5,3.5) node {$3$};
|
|
387 |
\draw (5.5,3.5) node {$3$};
|
|
388 |
\draw (6.5,3.5) node {$3$};
|
|
389 |
\draw (7.5,3.5) node {$\ldots$};
|
|
390 |
||
391 |
\draw (1.5,2.5) node {$1$};
|
|
392 |
\draw (2.5,2.5) node {\only<1-2>{$2$}\only<3->{$3$}};
|
|
393 |
\draw (3.5,2.5) node {$3$};
|
|
394 |
\draw (4.5,2.5) node {$4$};
|
|
395 |
\draw (5.5,2.5) node {$5$};
|
|
396 |
\draw (6.5,2.5) node {$6$};
|
|
397 |
\draw (7.5,2.5) node {$7$};
|
|
398 |
||
399 |
\draw (1.5,1.5) node {$0$};
|
|
400 |
\draw (2.5,1.5) node {$1$};
|
|
401 |
\draw (3.5,1.5) node {\only<1-3>{$0$}\only<4->{$1$}};
|
|
402 |
\draw (4.5,1.5) node {$1$};
|
|
403 |
\draw (5.5,1.5) node {$0$};
|
|
404 |
\draw (6.5,1.5) node {$\ldots$};
|
|
405 |
||
406 |
\draw (1.5,0.5) node {$7$};
|
|
407 |
\draw (2.5,0.5) node {$8$};
|
|
408 |
\draw (3.5,0.5) node {$5$};
|
|
409 |
\draw (4.5,0.5) node {\only<1-4>{$3$}\only<5->{$4$}};
|
|
410 |
\draw (5.5,0.5) node {$9$};
|
|
411 |
\draw (6.5,0.5) node {$\ldots$};
|
|
412 |
||
413 |
\draw (1.5,-0.5) node {$\ldots$};
|
|
414 |
\draw (8.5,3.5) node {$\ldots$};
|
|
415 |
\end{tikzpicture}
|
|
416 |
\end{center}
|
|
417 |
\mbox{}\\[-20mm]\mbox{}
|
|
418 |
||
419 |
\onslide<6->{
|
|
420 |
\begin{center}
|
|
421 |
\Large\bl{$|\mathbb{N}| < |R|$}
|
|
422 |
\end{center}
|
|
423 |
} |
|
424 |
||
425 |
\end{frame}
|
|
426 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
427 |
||
428 |
||
429 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
430 |
\mode<presentation>{
|
|
431 |
\begin{frame}[t]
|
|
432 |
\frametitle{The Set of Problems}
|
|
433 |
||
434 |
$\aleph_0$ |
|
435 |
||
436 |
\begin{center}
|
|
437 |
\begin{tikzpicture}
|
|
438 |
\draw [fill, color=black!50] (1,4) rectangle (2, 3); |
|
439 |
\draw [fill, color=black!50] (2,3) rectangle (3, 2); |
|
440 |
\draw [fill, color=black!50] (3,2) rectangle (4, 1); |
|
441 |
\draw [fill, color=black!50] (4,1) rectangle (5, 0); |
|
442 |
\draw (0, 0) grid (8, 5); |
|
443 |
\draw [line width = 1.mm] (1,0) -- (1, 5); |
|
444 |
\draw [line width = 1.mm] (0, 4) -- (8, 4); |
|
445 |
\draw (0.5,3.5) node {$1$};
|
|
446 |
\draw (0.5,2.5) node {$2$};
|
|
447 |
\draw (0.5,1.5) node {$3$};
|
|
448 |
\draw (0.5,0.5) node {$4$};
|
|
449 |
||
450 |
\draw (1.5,4.5) node {$0$};
|
|
451 |
\draw (2.5,4.5) node {$1$};
|
|
452 |
\draw (3.5,4.5) node {$2$};
|
|
453 |
\draw (4.5,4.5) node {$3$};
|
|
454 |
\draw (5.5,4.5) node {$4$};
|
|
455 |
\draw (6.5,4.5) node {$5$};
|
|
456 |
\draw (7.5,4.5) node {$\ldots$};
|
|
457 |
||
458 |
\draw (1.5,3.5) node {$0$};
|
|
459 |
\draw (2.5,3.5) node {$1$};
|
|
460 |
\draw (3.5,3.5) node {$0$};
|
|
461 |
\draw (4.5,3.5) node {$1$};
|
|
462 |
\draw (5.5,3.5) node {$0$};
|
|
463 |
\draw (6.5,3.5) node {$1$};
|
|
464 |
\draw (7.5,3.5) node {$\ldots$};
|
|
465 |
||
466 |
\draw (1.5,2.5) node {$0$};
|
|
467 |
\draw (2.5,2.5) node {$0$};
|
|
468 |
\draw (3.5,2.5) node {$0$};
|
|
469 |
\draw (4.5,2.5) node {$1$};
|
|
470 |
\draw (5.5,2.5) node {$1$};
|
|
471 |
\draw (6.5,2.5) node {$0$};
|
|
472 |
\draw (7.5,2.5) node {$0$};
|
|
473 |
||
474 |
\draw (1.5,1.5) node {$0$};
|
|
475 |
\draw (2.5,1.5) node {$0$};
|
|
476 |
\draw (3.5,1.5) node {$0$};
|
|
477 |
\draw (4.5,1.5) node {$0$};
|
|
478 |
\draw (5.5,1.5) node {$0$};
|
|
479 |
\draw (6.5,1.5) node {$\ldots$};
|
|
480 |
||
481 |
\draw (1.5,0.5) node {$1$};
|
|
482 |
\draw (2.5,0.5) node {$1$};
|
|
483 |
\draw (3.5,0.5) node {$0$};
|
|
484 |
\draw (4.5,0.5) node {$1$};
|
|
485 |
\draw (5.5,0.5) node {$1$};
|
|
486 |
\draw (6.5,0.5) node {$\ldots$};
|
|
487 |
||
488 |
\draw (1.5,-0.5) node {$\ldots$};
|
|
489 |
\draw (8.5,3.5) node {$\ldots$};
|
|
490 |
||
491 |
\end{tikzpicture}
|
|
492 |
\end{center}
|
|
493 |
||
494 |
||
495 |
\onslide<2>{
|
|
496 |
\begin{center}
|
|
497 |
\large \bl{|Progs| $=$ $|\mathbb{N}|$ $<$ |Probs|}
|
|
498 |
\end{center}
|
|
499 |
} |
|
500 |
||
501 |
||
502 |
\end{frame}}
|
|
503 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
504 |
||
505 |
||
506 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
507 |
\mode<presentation>{
|
|
508 |
\begin{frame}[c]
|
|
509 |
\frametitle{Halting Problem}
|
|
510 |
||
511 |
\large |
|
512 |
Assume a program \bl{$H$} that decides for all programs \bl{$A$} and all
|
|
513 |
input data \bl{$D$} whether\bigskip
|
|
514 |
||
515 |
\begin{itemize}
|
|
516 |
\item \bl{$H(A, D) \dn 1$} iff \bl{$A(D)$} terminates
|
|
517 |
\item \bl{$H(A, D) \dn 0$} otherwise
|
|
518 |
\end{itemize}
|
|
519 |
||
520 |
\end{frame}}
|
|
521 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
522 |
||
523 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
524 |
\mode<presentation>{
|
|
525 |
\begin{frame}[c]
|
|
526 |
\frametitle{Halting Problem (2)}
|
|
527 |
||
528 |
\large |
|
529 |
Given such a program \bl{$H$} define the following program \bl{$C$}:
|
|
530 |
for all programs \bl{$A$}\bigskip
|
|
531 |
||
532 |
\begin{itemize}
|
|
533 |
\item \bl{$C(A) \dn 0$} iff \bl{$H(A, A) = 0$}
|
|
534 |
\item \bl{$C(A) \dn$ loops} otherwise
|
|
535 |
\end{itemize}
|
|
536 |
||
537 |
\end{frame}}
|
|
538 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
539 |
||
540 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
541 |
\mode<presentation>{
|
|
542 |
\begin{frame}[c]
|
|
543 |
\frametitle{Contradiction}
|
|
544 |
||
545 |
||
546 |
\bl{$H(C, C)$} is either \bl{$0$} or \bl{$1$}.
|
|
547 |
||
548 |
\begin{itemize}
|
|
549 |
\item \bl{$H(C, C) = 1$} $\stackrel{\text{def}\,H}{\Rightarrow}$ \bl{$C(C)\downarrow$} $\stackrel{\text{def}\,C}{\Rightarrow}$ \bl{$H(C, C)=0$}
|
|
550 |
\item \bl{$H(C, C) = 0$} $\stackrel{\text{def}\,H}{\Rightarrow}$ \bl{$C(C)$} loops $\stackrel{\text{def}\,C}{\Rightarrow}$\\
|
|
551 |
\hspace{7cm}\bl{$H(C, C)=1$}
|
|
552 |
\end{itemize}
|
|
553 |
||
554 |
Contradiction in both cases. So \bl{$H$} cannot exist.
|
|
555 |
||
556 |
\end{frame}}
|
|
557 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
558 |
||
559 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
560 |
\mode<presentation>{
|
|
561 |
\begin{frame}[c]
|
|
562 |
\frametitle{Take Home Points}
|
|
563 |
\large |
|
564 |
||
565 |
\begin{itemize}
|
|
566 |
\item there are sets that are more infinite than others\bigskip |
|
567 |
\item even with the most powerful computer we can imagine, there |
|
568 |
are problems that cannot be solved by any program\bigskip\bigskip |
|
569 |
||
570 |
\item in CS we actually hit quite often such problems (halting problem) |
|
571 |
\end{itemize}
|
|
572 |
||
573 |
\end{frame}}
|
|
574 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
|
575 |
||
|
86
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
576 |
\end{document}
|
|
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
577 |
|
|
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
578 |
%%% Local Variables: |
|
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
579 |
%%% mode: latex |
|
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
580 |
%%% TeX-master: t |
|
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
581 |
%%% End: |
|
6a7fe83820c8
added
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
582 |