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LaTeX
  1. Avec le paquetage pst-node.

    \begin{psmatrix}[mnode=circle]
         & {v2}        \\
    {v1} &      & {v4} \\
         & {v3} & 
    \end{psmatrix}
    
    \psset{arrows=->,
           shortput=nab}
    
    \ncline{2,1}{1,2}^{3} 
    \ncline{2,1}{3,2}^{1}
    \ncline{1,2}{2,3}^{2}
    \ncline{3,2}{2,3}^{3}
    
    \ncarc[arcangle=10]{1,2}{3,2}^{1}
    \ncarc[arcangle=10]{3,2}{1,2}^{1}