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si1 (standard SI)

$\displaystyle \frac{dS}{dt}$ $\displaystyle =-r S(t) I(t)$    
$\displaystyle \frac{dI}{dt}$ $\displaystyle =r S(t) I(t)$    

Figure 4.1: $ S$ and $ I$
\includegraphics[scale=1]{images/si1.eps}


Nicolas Bacaer 2004-06-18