diff --git a/1ST/06_Generalite_sur_les_suites/1B_covid.pdf b/1ST/06_Generalite_sur_les_suites/1B_covid.pdf
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diff --git a/1ST/06_Generalite_sur_les_suites/1B_covid.tex b/1ST/06_Generalite_sur_les_suites/1B_covid.tex
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+\documentclass[a4paper,10pt]{article}
+\usepackage{myXsim}
+
+\author{Benjamin Bertrand}
+\title{Généralité suite - Cours}
+\date{Février 2023}
+
+\pagestyle{empty}
+
+\begin{document}
+
+\maketitle
+
+\section{Modélisation avec des suites}
+
+En se basant sur les premières données de malade du covid19, nous avons cherché à prédire le nombre de contaminés les jours suivants.
+
+\begin{center}
+    \begin{tabular}{|l|c|}\hline%
+        \bfseries Jour & \bfseries Nombre de cas
+        \csvreader[head to column names]{./covid_0226_0301.csv}{}%
+        {\\\jours & \cas}%
+        \\\hline
+    \end{tabular}
+
+    \smallskip
+    \textbf{Document:} Nombre de cas cumulé de covid
+\end{center}
+
+Pour cela, nous avons étudié deux modèles
+
+\bigskip
+\begin{minipage}{0.5\textwidth}
+    \begin{center}
+        Modèle 1: Linéaire
+    \end{center}
+
+    \begin{tikzpicture}[
+        roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
+        ]
+        %Nodes
+        \node[roundnode]        (leftterme)        {\makebox[0.5cm]{}};
+        \node[roundnode]        (centerterm)      [right=of leftterme] {\makebox[0.5cm]{}};
+
+        %Lines
+        \path[->] (leftterme.east) edge [bend left] node [above]  {$+$....} (centerterm.west);
+    \end{tikzpicture}
+    \hspace{1cm}
+    $ u_{n+1} = u_n + .... $
+
+    \medskip
+
+    C'est une suite \textbf{arithmétique}.
+
+    \medskip
+    \begin{center}
+        \includegraphics[scale=0.3]{./fig/covid_arith}
+
+    \medskip
+
+        \begin{tikzpicture}[baseline=(a.north), xscale=1, yscale=1]
+            \tkzInit[xmin=0,xmax=5,xstep=1,
+            ymin=0,ymax=5,ystep=1]
+            \tkzDrawX[noticks]
+            \tkzDrawY[noticks]
+        \end{tikzpicture}
+    \end{center}
+\end{minipage}
+\begin{minipage}{0.5\textwidth}
+   \begin{center}
+       Modèle 2: Exponentiel
+    \end{center}
+
+    \begin{tikzpicture}[
+        roundnode/.style={circle, draw=highlightbg, fill=green!5, very thick, minimum size=3mm},
+        ]
+        %Nodes
+        \node[roundnode]        (leftterme)        {\makebox[0.5cm]{}};
+        \node[roundnode]        (centerterm)      [right=of leftterme] {\makebox[0.5cm]{}};
+
+        %Lines
+        \path[->] (leftterme.east) edge [bend left] node [above]  {$\times$....} (centerterm.west);
+    \end{tikzpicture}
+    \hspace{1cm}
+    $ u_{n+1} = u_n \times .... $
+
+    \medskip
+
+    C'est une suite \textbf{géométrique}.
+
+    \medskip
+    \begin{center}
+        \includegraphics[scale=0.2]{./fig/corid_geo}
+
+        \medskip
+
+        \begin{tikzpicture}[baseline=(a.north), xscale=1, yscale=1]
+            \tkzInit[xmin=0,xmax=5,xstep=1,
+            ymin=0,ymax=5,ystep=1]
+            \tkzDrawX[noticks]
+            \tkzDrawY[noticks]
+        \end{tikzpicture}
+    \end{center}
+\end{minipage}
+
+\afaire{Tracer l'allure du graphique et compléter les pointillés.}
+
+\end{document}
diff --git a/1ST/06_Generalite_sur_les_suites/fig/corid_geo.png b/1ST/06_Generalite_sur_les_suites/fig/corid_geo.png
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diff --git a/1ST/06_Generalite_sur_les_suites/fig/covid_arith.png b/1ST/06_Generalite_sur_les_suites/fig/covid_arith.png
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