Image :

(La)TeX

Source :

\begin{center}
\psset{unit=5mm}\begin{pspicture}(26,18)
\psgrid[gridlabelcolor=white,subgriddiv=1]
\pspolygon[linewidth=2pt,fillstyle=solid,fillcolor=white](7,7)(7,9)(9,9)(10,7)
\psline(12.9,11.1)(13.1,10.9) \psline(12.9,10.9)(13.1,11.1)
\psline(17.9,8.1)(18.1,7.9) \psline(17.9,7.9)(18.1,8.1)
\uput[dl](7,7){A} \uput[ul](13,11){B} \uput[dr](18,8){C}
\rput(8.5,8){$\mathcal{F}$}
\end{pspicture}
\end{center}
    

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