From 362ce5d5dc7aa081696c0707d52111947a69c31a Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Tue, 16 Feb 2016 15:46:21 +0100
Subject: Illustration for Hercules-versus-Hydra game.

---
 notes-mitro206.tex | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 62 insertions(+), 1 deletion(-)

diff --git a/notes-mitro206.tex b/notes-mitro206.tex
index f50a49d..11fd8c2 100644
--- a/notes-mitro206.tex
+++ b/notes-mitro206.tex
@@ -18,7 +18,7 @@
 \usepackage{graphics}
 \usepackage[usenames,dvipsnames]{xcolor}
 \usepackage{tikz}
-\usetikzlibrary{matrix}
+\usetikzlibrary{matrix,calc}
 %
 \theoremstyle{definition}
 \newtheorem{comcnt}{Tout}[subsection]
@@ -647,6 +647,67 @@ souhaite.  Hercule gagne s'il réussit à décapiter le dernier nœud de
 l'hydre ; l'hydre gagnerait si elle réussissait à survivre
 indéfiniment.
 
+\begin{center}
+\begin{tikzpicture}[baseline=0]
+\draw[very thin] (-1.5,0) -- (1.5,0);
+\begin{scope}[every node/.style={circle,fill,inner sep=0.5mm}]
+\node (P0) at (0,0) {};
+\node (P1) at (0,1) {};
+\node (P2) at (-1,2) {};
+\node (P3) at (0,2) {};
+\node (P4) at (1,2) {};
+\node (P5) at (0.5,3) {};
+\node (P6) at (1.5,3) {};
+\end{scope}
+\begin{scope}[line width=1.5pt]
+\draw (P0) -- (P1);
+\draw (P1) -- (P2);
+\draw (P1) -- (P3);
+\draw (P1) -- (P4);
+\draw (P4) -- (P5);
+\draw (P4) -- (P6);
+\end{scope}
+\begin{scope}[line width=3pt,red]
+\draw ($(P6) + (-0.2,-0.2)$) -- ($(P6) + (0.2,0.2)$);
+\draw ($(P6) + (-0.2,0.2)$) -- ($(P6) + (0.2,-0.2)$);
+\end{scope}
+\node[anchor=west] at (P6) {$x$};
+\node[anchor=west] at (P4) {$y$};
+\node[anchor=west] at (P1) {$z$};
+\end{tikzpicture}
+devient
+\begin{tikzpicture}[baseline=0]
+\draw[very thin] (-1.5,0) -- (1.5,0);
+\begin{scope}[every node/.style={circle,fill,inner sep=0.5mm}]
+\node (P0) at (0,0) {};
+\node (P1) at (0,1) {};
+\node (P2) at (-1,2) {};
+\node (P3) at (0,2) {};
+\node (P4) at (0.8,2) {};
+\node (P5) at (0.6,3) {};
+\node (P4b) at (1.2,2) {};
+\node (P5b) at (1.2,3) {};
+\node (P4c) at (1.7,2) {};
+\node (P5c) at (1.7,3) {};
+\node (P4d) at (2.2,2) {};
+\node (P5d) at (2.2,3) {};
+\end{scope}
+\begin{scope}[line width=1.5pt]
+\draw (P0) -- (P1);
+\draw (P1) -- (P2);
+\draw (P1) -- (P3);
+\draw (P1) -- (P4);
+\draw (P4) -- (P5);
+\draw[blue] (P1) -- (P4b);
+\draw[blue] (P4b) -- (P5b);
+\draw[blue] (P1) -- (P4c);
+\draw[blue] (P4c) -- (P5c);
+\draw[blue] (P1) -- (P4d);
+\draw[blue] (P4d) -- (P5d);
+\end{scope}
+\end{tikzpicture}
+\end{center}
+
 Ce jeu est particulier en ce que, mathématiquement, non seulement
 Hercule possède une stratégie gagnante, mais en fait Hercule gagne
 \emph{toujours}, quoi qu'il fasse et quoi que fasse l'hydre.
-- 
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