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+
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new file mode 100644
index 0000000..d2482bf
--- /dev/null
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new file mode 100644
index 0000000..3c9707e
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+++ b/src/Lecture3/live/tikz.synctex.gz
diff --git a/src/Lecture3/live/tikz.tex b/src/Lecture3/live/tikz.tex
new file mode 100644
index 0000000..65dbd5d
--- /dev/null
+++ b/src/Lecture3/live/tikz.tex
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diff --git a/src/Lecture3/slides/4-TikZ.nav b/src/Lecture3/slides/4-TikZ.nav
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diff --git a/src/Lecture3/slides/4-TikZ.out b/src/Lecture3/slides/4-TikZ.out
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diff --git a/src/Lecture3/slides/4-TikZ.snm b/src/Lecture3/slides/4-TikZ.snm
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diff --git a/src/Lecture3/slides/4-TikZ.tex b/src/Lecture3/slides/4-TikZ.tex
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+\documentclass[11pt]{beamer}
+\usetheme{Madrid}
+\usepackage[utf8]{inputenc}
+\usepackage{amsmath, amssymb, amsfonts, amsthm}
+\usepackage{xcolor}
+
+\usepackage{tikz-cd}
+%\usepackage{enumitem}
+
+\newcommand{\ti}{Ti\emph{k}Z}
+
+\author[\texttt{sebastiano.tronto@uni.lu}]{Sebastiano Tronto}
+\title{The {\ti } graphics package}
+\logo{\includegraphics[scale=0.1]{img/unilu.jpg}} 
+%\institute{University of Luxembourg} 
+
+\newcommand{\bs}{\textbackslash}
+
+\date{2021-03-26} 
+
+\begin{document}
+
+\begin{frame}
+  \titlepage
+\end{frame}
+
+
+\begin{frame}{\ti}
+  \begin{center}
+    ``{\ti } ist \emph{kein} Zeichenprogramm''
+  \end{center}
+
+  \vspace{1cm}
+  \begin{itemize}
+    \item ``Writing'' graphics as you write text and formulas in LaTeX
+          \begin{align*}
+            \text{\ti} : \text{graphics} = \text{LaTeX} : \text{text}
+          \end{align*}
+    \item Draw shapes, paths, diagrams...
+    \item Countless extension packages
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{References}
+  \begin{itemize}
+    \item Wikibooks, short introduction:
+          \url{https://en.wikibooks.org/wiki/LaTeX/PGF/TikZ}
+
+    \vspace{0.2cm}
+    \item Official manual:
+        {\small\url{http://ctan.cs.uu.nl/graphics/pgf/base/doc/pgfmanual.pdf}}
+
+          (Too long, but nice examples in part \textrm{I})
+
+    \vspace{0.2cm}
+    \item Extension packages and their documentation:
+          \url{https://www.ctan.org/topic/pgf-tikz}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Using {\ti}}
+  \begin{itemize}
+    \item In preamble:
+  
+          \vspace{0.2cm}
+          \texttt{\bs usepackage\{tikz\}}
+  
+          \texttt{\bs usetikzlibrary\{something\} \% if needed}
+  
+    \vspace{0.2cm}
+    \item In document body:
+    
+          \vspace{0.2cm}
+          \texttt{\bs begin\{tikzpicture\} (\dots) \bs end\{tikzpicture\}}
+
+    \vspace{0.2cm}
+    \item Use \texttt{[scale=\emph{n},rotate=\emph{angle}]} to scale or rotate
+          the whole picture.
+  \end{itemize}
+\end{frame}
+
+
+\begin{frame}{Coordinates}
+  \begin{itemize}
+    \item $3$ ways to express coordinates:
+
+      \vspace{0.2cm}
+      \begin{itemize}
+        \item Cartesian, no unit = cm
+
+              Example: \texttt{(2cm,11pt)}
+
+              \vspace{0.2cm}
+        \item Polar 
+        
+              Example: \texttt{(180:7cm)}
+
+              \vspace{0.2cm}
+        \item Intersection of vertical line through $p_1$ and horizontal line
+              through $p_2$, points expressed as above (no parenthesis)
+              
+              Example: \texttt{(0,1 |- 30:2)}
+      \end{itemize}
+    \item More intersections: \texttt{\bs usetikzlibrary\{intersections\}}
+    \item Give names to points: \texttt{\bs coordinate (X) at (1,-4);}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Drawing straight lines}
+  \begin{center}
+    \texttt{\bs draw (P1) -- (P2) -- ... -- (Pn);}
+  \end{center}
+
+  \vspace{0.5cm}
+  \begin{itemize}
+    \item Points expressed in coordinates as before.
+    \item Add \texttt{-- cycle} to close the path.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Curved lines and other shapes}
+  \begin{tabular}{c|l}
+    \tikz \draw (0,0) arc [start angle=30, end angle=120, radius=2cm];    
+    & \begin{tabular}{c}
+        \texttt{\bs draw (0,0) arc [start angle=30,} \\
+        \texttt{end angle=120, radius=2cm];}
+      \end{tabular} \\
+    \hline
+    \begin{tikzpicture}
+      \draw[white] (2,1) -- (2,1.2); % Just for spacing the table
+      \draw (0,0) rectangle (2,1);
+    \end{tikzpicture} &
+      \texttt{\bs draw (0,0) rectangle (2,1);} \\
+    \hline
+    \begin{tikzpicture}
+      \draw[white] (0,0) -- (0,0.7); % Just for spacing the table
+      \draw (0,0) circle [radius=0.5];
+    \end{tikzpicture} &
+    \texttt{\bs draw (0,0) circle [radius=0.5];} \\
+    \hline
+    \begin{tikzpicture}
+      \draw[white] (0,0) -- (0,0.7); % Just for spacing the table
+      \draw (0,0) circle [x radius=1,y radius=0.5];
+    \end{tikzpicture} &
+    \texttt{\dots [x radius=1,y radius=0.5];} \\
+  \end{tabular}
+\end{frame}
+
+\begin{frame}[fragile]{Bezier curves}
+  \texttt{\bs draw (P1) ..controls (C1) and (C2).. (P2);}
+
+  \vspace{0.5cm}
+  \begin{columns}
+  \column{0.6\textwidth}
+    A curve  from \texttt{P1} to \texttt{P2}, starting in direction of
+    \texttt{C1} and arriving from the direction of \texttt{C2} (usually not
+    touching the control points).
+
+    \vspace{0.5cm}
+    \href{https://en.wikipedia.org/wiki/B\%C3\%A9zier\_curve}
+         {https://en.wikipedia.org/wiki/Bézier\_curve}
+  \column{0.4\textwidth}
+    \begin{tikzpicture}
+        \coordinate (P1) at (0,0);
+        \coordinate (P2) at (4,1);
+        \coordinate (C1) at (0,3);
+        \coordinate (C2) at (3,2);
+        
+        \draw[lightgray] (P1) foreach \p in {P1,C1,C2,P2} {-- (\p)};
+        \foreach \p in {P1,C1,C2,P2} {
+                \fill[blue] (\p) circle[radius=0.1] node[label=\p] {};
+        };
+        \draw[thick] (P1) ..controls (C1) and (C2).. (P2);
+    \end{tikzpicture}
+  \end{columns}
+\end{frame}
+
+\begin{frame}{Colors}
+  \begin{itemize}
+    \item Color names already defined: \texttt{red, green, blue, yellow,}
+          \texttt{black, white, gray, darkgray, lightgray, brown, pink\dots}
+
+    \vspace{0.2cm}
+    \item Specify intensity: \texttt{color!n} with $0\leq n \leq 100$.
+
+    \vspace{0.2cm}
+    \item Mix colors: \texttt{color1!n1!color2!n2!\dots}
+
+    \vspace{0.2cm}
+    \item Example:
+          \begin{center}
+            \texttt{blue!50!red!50!green}
+          \end{center}
+          is 50\% blue, 25\% red and 25\% green.
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Filldraw, change color and line style}
+  \begin{itemize}
+    \item \texttt{\bs draw[\emph{colorname}]} to specify color.
+
+    \vspace{0.2cm}
+    \item \texttt{\bs filldraw[fill=\emph{fillcolor}, draw=\emph{bordercolor}]}
+          to fill path or \texttt{\bs fill} for no border.
+
+    \vspace{0.2cm}
+    \item Line width: \texttt{\bs draw[\emph{thickness}]}, where
+          \texttt{\emph{thickness}} can be \texttt{very thin, thin, thick, very
+          thick\dots} or \texttt{\bs draw[line width=\emph{length}]} where
+          \texttt{\emph{length}} can be \texttt{3pt, 0.1mm\dots}
+
+    \vspace{0.2cm}
+    \item Line style: \texttt{[dashed]} for dashed,
+          \texttt{[->]} or \texttt{[<-]} for arrow.
+  \end{itemize}
+\end{frame}
+
+
+\begin{frame}{Example}
+  \begin{center}
+    \begin{tikzpicture}[scale=0.6]
+        \colorlet{coscolor}{blue}
+        \colorlet{sincolor}{red}
+        \tikzset{anglefill/.style={draw=green,fill=green!30}}
+        
+        \pgfmathsetmacro{\r}{4}
+        \pgfmathsetmacro{\a}{60}
+
+        \draw[lightgray!30] (-5,-5) grid[step=1] (5,5);
+        \draw[thick,->] (0,-5) -- (0,5);
+        \draw[thick,->] (-5,0) -- (5,0);
+        
+        \filldraw[anglefill] (0,0) -- node[above]{$\a^\circ$}
+          (\r/3,0) arc [start angle=0,end angle=\a,radius=\r/3] -- cycle;
+        \draw[thick] (0,0) circle[radius=\r] -- (\a:\r);
+        \draw[very thick,coscolor] (0,0) --
+          node[below]{$\cos(\a^\circ)$} (\r*cos{\a},0); 
+        \draw[very thick,sincolor] (\r*cos{\a},0) --
+          node[right]{$\sin\a^\circ$}(\a:\r);
+    \end{tikzpicture}
+  \end{center}
+\end{frame}
+
+\begin{frame}{Adding text: nodes}
+  \texttt{\bs draw (P1) {\color{red}--} node[\emph{position}]
+          \{\emph{text}\} (P2) \dots}
+
+  \vspace{0.5cm}
+  \texttt{\bs draw {\color{red}(P1)} node[\emph{position}]
+          \{\emph{text}\} -- (P2) \dots}
+
+  \vspace{0.5cm}
+  \begin{itemize}
+    \item A node can refer to a line or to a point
+    \item \texttt{\emph{position}} can be \texttt{above, below, left} or
+          \texttt{right}
+    \item \texttt{\emph{text}} can also be \texttt{\$math\$}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Macros}
+  \texttt{\bs pgfmathsetmacro\{\bs x\}\{\emph{value}\}}
+
+  %\texttt{\bs colorlet\{\emph{colorname}\}\{\emph{color}\}}
+
+  \vspace{0.5cm}
+  Examples:
+
+  \vspace{0.2cm}
+  \texttt{\bs pgfmathsetmacro\{\bs r\}\{4\}}
+
+  \texttt{\bs pgfmathsetmacro\{\bs a\}\{30\}}
+\end{frame}
+
+\begin{frame}[fragile,shrink]{Example - {\ti } code} 
+  \begin{verbatim}
+  \begin{tikzpicture}
+      \colorlet{coscolor}{blue}
+      \colorlet{sincolor}{red}
+      \tikzset{anglefill/.style={draw=green,fill=green!30}}
+      \pgfmathsetmacro{\r}{4}
+      \pgfmathsetmacro{\a}{60}
+
+      \draw[lightgray!30] (-5,-5) grid[step=1] (5,5);
+      \draw[thick,->] (0,-5) -- (0,5);
+      \draw[thick,->] (-5,0) -- (5,0);
+        
+      \filldraw[anglefill] (0,0) -- node[above]{$\a^\circ$}
+          (\r/3,0) arc [start angle=0,end angle=\a,radius=\r/3] -- cycle;
+      \draw[thick] (0,0) circle[radius=\r] -- (\a:\r);
+      \draw[very thick,coscolor] (0,0) --
+          node[below]{$\cos(\a^\circ)$} (\r*cos{\a},0); 
+      \draw[very thick,sincolor] (\r*cos{\a},0) --
+          node[right]{$\sin\a^\circ$}(\a:\r);
+  \end{tikzpicture}
+  \end{verbatim}
+\end{frame}
+
+\begin{frame}{The \texttt{\bs foreach} command}
+  \texttt{\bs foreach \bs i in \{\emph{list}\} \{ \emph{commands} \};}
+
+  \vspace{0.5cm}
+  \begin{itemize}
+    \item \texttt{\emph{list}} can be fully explicit (like
+          \texttt{\{1,7.2,-42\}}) or partially implicit
+          (like \texttt{\{1.5,1.6,\dots,5.0\}})
+    \item \texttt{\emph{commands}} will be repeated with \texttt{\bs i}
+          varying in \texttt{\emph{list}}
+    \item One can use \texttt{foreach} inside a \texttt{\bs draw}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{\texttt{\bs foreach} examples}
+  \begin{tabular}{c|l}
+    \tikz \foreach \i in {1,2,3,4} {\draw (\i,0) circle [radius=0.4];}; &
+      \begin{tabular}{l}
+        \texttt{\bs foreach \bs i in \{1,2,3,4\}} \\
+        \texttt{\{\bs draw (\bs i,0) circle [radius=0.4];\}}
+      \end{tabular} \\
+    \tikz[scale=2]\draw (0,0) \foreach\i in {0.0,0.3,...,1.5} {-- (\i,\i^2)}; &
+      \begin{tabular}{l}
+        \texttt{\bs draw (0,0) \bs foreach \bs i in} \\
+        \texttt{  \{0.0,0.3,...,1.5\} \{-- (\bs i,\bs i\^{}2)\};}
+      \end{tabular}
+  \end{tabular}
+\end{frame}
+
+\begin{frame}{External packages}
+  Many external packages, include with \texttt{\bs usepackage}:
+  \url{https://www.ctan.org/topic/pgf-tikz}
+
+  \vspace{0.3cm}
+  \begin{itemize}
+    \item Graphs and similar: \texttt{tikz-cd, adigraph, binarytree\dots}
+    \item Diagrams: \texttt{pgf-pie, bchart, venndiagram\dots}
+    \item Other sciences: \texttt{chemfig, CircuiTikZ\dots}
+    \item Fun: \texttt{battleship, TikZducks, tikz-among-us\dots}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Commutative diagrams}
+  \begin{center}
+    \begin{tikzcd}
+      T \arrow[drr, bend left, "x"] \arrow[ddr, bend right, "y"']
+        \arrow[dr, dotted, "{(x,y)}" description] & & \\
+      & X \times_Z Y \arrow[r, "p"] \arrow[d, "q"] & X \arrow[d, "f"] \\
+      & Y \arrow[r, "g"] & Z
+    \end{tikzcd}
+  \end{center}
+\end{frame}
+
+\begin{frame}{tikz-cd}
+
+  Reference:
+  {\footnotesize
+  \url{http://ctan.cs.uu.nl/graphics/pgf/contrib/tikz-cd/tikz-cd-doc.pdf}}
+
+  \vspace{0.7cm}
+  \texttt{\bs usepackage\{tikz-cd\}}
+
+  \vspace{0.2cm}
+  \texttt{\bs begin\{tikzcd\}\dots \bs end\{tikzcd\}}
+
+  \vspace{0.5cm}
+  \begin{itemize}
+    \item Works as a \texttt{tabular} or \texttt{matrix} (with \texttt{\&} and
+          \texttt{\bs\bs})
+    \item Everything is in math mode by default
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Arrows}
+  \texttt{\bs arrow[\emph{direction},"label",other options]}
+
+  \vspace{0.5cm}
+  \begin{itemize}
+    \item \texttt{\emph{direction}} can be any combination of the letters
+          \texttt r (right), \texttt l (left), \texttt d (down) and
+          \texttt u (up)
+    \item The target must exist:
+          \begin{center}
+            \begin{tabular}{ll}
+              \texttt{X \bs arrow[r] \& Y} & \texttt{\% Ok} \\
+              \texttt{X \bs arrow[r] } & \texttt{\% Error}  \\
+              \texttt{X \bs arrow[r] \& \{\}} & \texttt{\% Ok}
+            \end{tabular}
+          \end{center}
+    \item Other options describe the shape and style of the arrow
+
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Examples}
+  \begin{tabular}{c|l}
+    \begin{tikzcd} X\arrow[r,dashed,"f"] & Y \end{tikzcd} &
+      \begin{tabular}{l}
+        \texttt{X \bs arrow[r,dashed,"f"] \& Y}
+      \end{tabular} \\
+    & \quad \\
+    \begin{tikzcd}
+      A\arrow[r,bend right,"\pi^2"] & B\arrow[r,bend left,tail] & C
+    \end{tikzcd} &
+      \begin{tabular}{l}
+        \texttt{A \bs arrow[r,bend right,"\bs pi\^{}2"] \&} \\
+        \texttt{B \bs arrow[r,bend left,tail] \& C}
+      \end{tabular} \\
+    & \quad \\
+    \begin{tikzcd}
+      A \arrow[d,"1"'] \arrow[dr,"2"] & B \\
+      C & D \arrow[l] \arrow[u,out=45,in=0]
+    \end{tikzcd} &
+      \begin{tabular}{l}
+        \texttt{A \bs arrow[d,"1"'] \bs arrow[dr,"2"] \& B \bs\bs} \\
+        \texttt{C \& D \bs arrow[l] \bs arrow[u,out=45,in=0]}
+      \end{tabular}
+  \end{tabular}
+\end{frame}
+
+\end{document}
+
diff --git a/src/Lecture3/slides/4-TikZ.toc b/src/Lecture3/slides/4-TikZ.toc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/Lecture3/slides/4-TikZ.toc
diff --git a/src/Lecture3/slides/4-TikZ.vrb b/src/Lecture3/slides/4-TikZ.vrb
new file mode 100644
index 0000000..e44a4eb
--- /dev/null
+++ b/src/Lecture3/slides/4-TikZ.vrb
@@ -0,0 +1,24 @@
+\frametitle{Examples}
+\begin{tabular}{c|l}
+    \begin{tikzcd} X\arrow[r,dashed,"f"] & Y \end{tikzcd} &
+      \begin{tabular}{l}
+        \texttt{X \bs arrow[r,dashed,"f"] \& Y}
+      \end{tabular} \\
+    & \quad \\
+    \begin{tikzcd}
+      A\arrow[r,bend right,"\pi^2"] & B\arrow[r,bend left,tail] & C
+    \end{tikzcd} &
+      \begin{tabular}{l}
+        \texttt{A \bs arrow[r,bend right,"\bs pi\^{}2"] \&} \\
+        \texttt{B \bs arrow[r,bend left,tail] \& C}
+      \end{tabular} \\
+    & \quad \\
+    \begin{tikzcd}
+      A \arrow[d,"1"'] \arrow[dr,"2"] & B \\
+      C & D \arrow[l] \arrow[u,out=45,in=0]
+    \end{tikzcd} &
+      \begin{tabular}{l}
+        \texttt{A \bs arrow[d,"1"'] \bs arrow[dr,"2"] \& B \bs\bs} \\
+        \texttt{C \& D \bs arrow[l] \bs arrow[u,out=45,in=0]}
+      \end{tabular}
+  \end{tabular}
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diff --git a/src/Lecture3/slides/5-Beamer.out b/src/Lecture3/slides/5-Beamer.out
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+\documentclass[11pt]{beamer}
+\usetheme{Madrid}
+\usepackage[utf8]{inputenc}
+\usepackage{amsmath, amssymb, amsfonts, amsthm}
+\usepackage{xcolor}
+
+\usepackage{tikz-cd}
+
+\author[\texttt{sebastiano.tronto@uni.lu}]{Sebastiano Tronto}
+\title{Presentations in LaTeX with Beamer}
+\logo{\includegraphics[scale=0.1]{img/unilu.jpg}} 
+%\institute{University of Luxembourg} 
+
+\newcommand{\bs}{\textbackslash}
+
+\date{2021-03-26} 
+
+\begin{document}
+
+\begin{frame}
+  \titlepage
+\end{frame}
+
+\begin{frame}{Why presentation with LaTeX?}
+  Pros:
+
+  \vspace{0.2cm}
+  \begin{itemize}
+    \item Easy to include formulas and theorems
+    \item Portability: \texttt{pdf} = \textbf{portable} document format
+    \item Very fast to get ``good enough'' results (subjective)
+  \end{itemize}
+
+  \vspace{0.5cm}
+  Cons:
+
+  \vspace{0.2cm}
+  \begin{itemize}
+    \item Advanced animations not possible with pdf
+    \item Lack of other presentation-specific features
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Structure of a Beamer document}
+  \includegraphics[scale=0.35]{img/beamer.png}
+\end{frame}
+
+\begin{frame}{The \texttt{frame} environment}
+  \texttt{\bs begin\{frame\}[options]\{Title\} \,\dots\, \bs end\{frame\}}
+
+  \vspace{0.5cm}
+  Useful options:
+  \begin{itemize}
+    \item \texttt{plain}: no bars on bottom or side
+    \item \texttt{shrink}: content is shrunk to fit in the slide
+    \item \texttt{fragile}: when you have \texttt{tikzpicture},
+          \texttt{listings} or similar 
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Basic animations}
+  \begin{itemize}
+    \item \texttt{\bs pause} for a simple break
+
+    \vspace{0.3cm}
+    \item \texttt{\bs only<start-(end)>\{\emph{stuff}\}} to show
+          \emph{\texttt{stuff}} only on some slides
+          
+          Shortcut for lists: \texttt{\bs item<\dots>} or
+          \texttt{\bs begin\{itemize\}[<+->]}
+
+    \vspace{0.3cm}
+    \item Optional:
+          \texttt{\bs setbeamercovered\{transparent\}} (see end of slides)
+
+    \vspace{0.3cm}
+    \item \texttt{\bs uncover<\dots>} does not take space when invisible
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Theorems and lists}
+  \begin{theorem} This is a Theorem \end{theorem}
+  \begin{proof} With proof \end{proof}
+  
+  \begin{itemize}
+    \item \texttt{theorem}, \texttt{proof} and \texttt{definition} already
+          included with beamer.
+    \item Define new theorems as usual (they get a box automatically)
+  \end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]{Custom blocks}
+
+  {
+    \setbeamercolor{block title}{fg=blue,bg=green}
+    \setbeamercolor{block body}{fg=black,bg=pink!50}
+    \begin{block}{A custom block, with ugly colors}
+      \begin{verbatim}
+{
+    \setbeamercolor{block title}{fg=blue,bg=green}
+    \setbeamercolor{block body}{fg=black,bg=pink!50}
+    
+    \begin{block}{A custom block, with ugly colors}
+        ...
+    \end{block}
+}
+      \end{verbatim}
+    \end{block}
+  }
+\end{frame}
+
+
+\begin{frame}{Multiple columns}
+  \begin{columns}
+  \column{0.3\textwidth}
+    \texttt{\bs begin\{columns\}}
+
+    \texttt{\qquad\bs column\{\emph{width}\}}
+
+    \texttt{\qquad(stuff)}
+
+    \texttt{\qquad\bs column\{\emph{width}\}}
+
+    \texttt{\qquad(more stuff)}
+
+    \texttt{\qquad\qquad\vdots}
+
+    \texttt{\bs end\{columns\}}
+  \column{0.7\textwidth}
+    \begin{itemize}
+      \item \texttt{\emph{width}} is a length (example:
+            \texttt{0.7\bs textwidth})
+      \item Example: picture on the left, text on the right
+      \item Not specific to Beamer
+      \item Alternative: \texttt{tabular}
+    \end{itemize}
+  \end{columns}
+
+\end{frame}
+
+\begin{frame}{Some advice}
+  \begin{itemize}
+    \item Do not prepare too many slides (1-2 minutes per slide)
+    \item Do not write too much in each slide (split if necessary)
+    \item Pictures and \texttt{itemize}s are great, sentences are not
+    \item Animations are ok (but are they worth the effort?)
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Examples}
+  Three examples will follow:
+  \begin{itemize}
+    \item A horrible slide
+    \item A better slide with the same content
+    \item A better better slide that took a little more time to write
+  \end{itemize}
+\end{frame}
+
+\begin{frame}{Diophantine equations (bad)}
+  Diophantine equations are a very old problem, dating back to Diophantus of
+  Alexandria (III century A.D.).
+
+  Despite this, they are still today a very hard problem, and there is
+  no general method or algorithm to solve them.
+
+  A notable example is \emph{Fermat's Last Theorem}, stated for the first time
+  in 1637 but proved to be true only in 1995, after more than 350 years!
+\end{frame}
+
+
+\begin{frame}{Diophantine Equations (better)}
+  \begin{itemize}
+    \item Very old problem
+    
+    \vspace{0.3cm}
+    \item Very simple formulation, but very hard to solve!
+    
+    \vspace{0.3cm}
+    \item ``Fermat's Last Theorem'': stated in 1637 - proved in 1995
+  \end{itemize}
+\end{frame}
+
+\setbeamercovered{transparent}
+\begin{frame}{Diophantine Equations (better better)}
+  \begin{columns}
+  \column{0.45\textwidth}
+    \begin{figure}
+      \begin{center}
+        \includegraphics[scale=0.2]{img/diophantus.jpg}
+        {\footnotesize Diophantus of Alexandria\\ (III century A.D.)}
+      \end{center}
+    \end{figure}
+  \column{0.55\textwidth}
+    \begin{itemize}
+      \item<1-> Very old problem
+      \item<2-> Very simple formulation, but very hard to solve!
+      \item<3-> \emph{Fermat's Last Theorem}: stated in 1637 - proved in 1995
+    \end{itemize}
+  \end{columns}
+\end{frame}
+
+
+\end{document}
diff --git a/src/Lecture3/slides/5-Beamer.toc b/src/Lecture3/slides/5-Beamer.toc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/Lecture3/slides/5-Beamer.toc
diff --git a/src/Lecture3/slides/5-Beamer.vrb b/src/Lecture3/slides/5-Beamer.vrb
new file mode 100644
index 0000000..ef0a439
--- /dev/null
+++ b/src/Lecture3/slides/5-Beamer.vrb
@@ -0,0 +1,18 @@
+\frametitle{Custom blocks}
+
+  {
+    \setbeamercolor{block title}{fg=blue,bg=green}
+    \setbeamercolor{block body}{fg=black,bg=pink!50}
+    \begin{block}{A custom block, with ugly colors}
+      \begin{verbatim}
+{
+    \setbeamercolor{block title}{fg=blue,bg=green}
+    \setbeamercolor{block body}{fg=black,bg=pink!50}
+
+    \begin{block}{A custom block, with ugly colors}
+        ...
+    \end{block}
+}
+      \end{verbatim}
+    \end{block}
+  }
diff --git a/src/Lecture3/slides/img/beamer.png b/src/Lecture3/slides/img/beamer.png
new file mode 100644
index 0000000..032c2e4
--- /dev/null
+++ b/src/Lecture3/slides/img/beamer.png
diff --git a/src/Lecture3/slides/img/diophantus.jpg b/src/Lecture3/slides/img/diophantus.jpg
new file mode 100644
index 0000000..c839140
--- /dev/null
+++ b/src/Lecture3/slides/img/diophantus.jpg
diff --git a/src/Lecture3/slides/img/unilu.jpg b/src/Lecture3/slides/img/unilu.jpg
new file mode 100644
index 0000000..5265563
--- /dev/null
+++ b/src/Lecture3/slides/img/unilu.jpg