\begin{pspicture}*(-1,-1)(2,5) \begin{psmatrix}[mnode=circle,colsep=2] & A \\ B & & E \\ C & D & F \end{psmatrix} \psset{arrows=->,arrowsize=6pt, labelsep=1mm,shortput=nab} %\nccircle{1,2}{0.5cm}^{6} \ncline{1,2}{2,1}^{$\times 2$} \ncline{1,2}{2,3}^{$\times (-1,5)$} \ncline{2,1}{3,1}_{$\times (-3)$} \ncline{3,1}{3,2}_{$\times (-2)$} \ncline{3,2}{3,3}_{$\times 0,5$} \ncline{2,1}{3,3}^{$\times (-2,2)$} \ncline{2,3}{3,3}^{$\times (-1,2)$} \ncline{2,1}{2,3}^{$\times (-3)$} %\ncline{1,2}{2,2}^{8} %\ncline{1,2}{3,3}^{9} %\ncline{2,1}{2,2}^{5} %\ncline{2,2}{3,2}^{3} %\ncline{3,3}{2,2}^{10} %\ncarc[arcangle=10]{3,3}{3,2}^{7} %\ncarc[arcangle=10]{3,2}{3,3}^{4} \end{pspicture}