diff --git a/slides/cours_24.md b/slides/cours_24.md
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+++ b/slides/cours_24.md
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+---
+title: "Graphes - Généralités"
+date: "2022-05-03"
+patat:
+ eval:
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+ command: fish
+ fragment: false
+ replace: true
+ ccc:
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+ images:
+ backend: auto
+---
+
+# Historique
+
+**Un mini-peu d'histoire...**
+
+## L. Euler, les 7 ponts de Koenigsberg:
+
+* Existe-t-il une promenade sympa, passant **une seule fois** par les 7 ponts et revenant au point de départ?
+
+{width=50%}
+
+. . .
+
+* Réponse: ben non!
+
+# Utilisation quotidienne
+
+## Réseau social
+
+{width=40%}
+
+* Chaque sommet est un individu.
+* Chaque trait une relation d'amitié.
+* Miam, Miam, Facebook.
+
+# Utilisation quotidienne
+
+## Moteurs de recherche
+
+{width=40%}
+
+* Sommet est un site.
+* Liens sortants;
+* Liens entrants;
+* Notion d'importance d'un site: combien de liens entrants, pondérés par l'importance du site.
+* Miam, Miam, Google (PageRank).
+
+# Introduction
+
+## Définition, plus ou moins
+
+* Un graphe est un ensemble de sommets, reliés par des lignes ou des flèches.
+
+
+
+* Des sommets (numérotés 1 à 6);
+* Connectés ou pas par des traits ou des flèches!
+
+# Généralités
+
+## Définitions
+
+* Un **graphe** $G(V, E)$ est constitué
+ * $V$: un ensemble de sommets;
+ * $E$: un ensemble d'arêtes.
+* Une **arête** relie une **paire** de sommets de $V$.
+
+## Remarques
+
+* Il y a **au plus** une arête $E$ par paire de sommets de $V$.
+* La **complexité** d'un algorithme dans un graphe se mesure en terme de $|E|$ et $|V|$, le nombre d'éléments de $E$ et $V$ respectivement.
+
+# Généralités
+
+## Notations
+
+* Une arête d'un graphe **non-orienté** est représentée par une paire **non-ordonnée** $(u,v)=(v,u)$, avec $u,v\in V$.
+* Les arêtes ne sont pas orientées dans un graphe non-orienté (elles sont bi-directionnelles, peuvent être parcourues dans n'importe quel ordre).
+
+## Exemple
+
+
+::: columns
+
+:::: column
+
+
+
+
+::::
+
+:::: column
+
+## Que valent $V$, $|V|$, $E$, et $|E|$?
+
+. . .
+
+\begin{align*}
+V&=\{1, 2, 3, 4\},\\
+|V|&=4,\\
+E&=\{(1,2),(2,3),(2,4),(4,1)\},\\
+|E|&=4.
+\end{align*}
+
+::::
+
+:::
+
+# Généralités
+
+## Notations
+
+* Une arête d'un graphe **orienté** est représentée par une paire **ordonnée** $(u,v)\neq(v,u)$, avec $u,v\in V$.
+* Les arêtes sont orientées dans un graphe orienté (étonnant non?).
+
+## Exemple
+
+
+::: columns
+
+:::: column
+
+
+
+
+::::
+
+:::: column
+
+## Que valent $V$, $|V|$, $E$, et $|E|$?
+
+. . .
+
+\begin{align*}
+V&=\{1, 2, 3, 4\},\\
+|V|&=4,\\
+E&=\{(1,2),(2,3),(2,4),(4,1)\},\\
+|E|&=4.
+\end{align*}
+
+::::
+
+:::
+
diff --git a/slides/figs/Konigsberg_bridges.png b/slides/figs/Konigsberg_bridges.png
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diff --git a/slides/figs/PageRanks-Example.svg b/slides/figs/PageRanks-Example.svg
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