  \begin{pspicture}*(-10,-5)(10,10)
      \psgrid[griddots=10, gridcolor=gray, subgriddiv =0](-10,-5)(10,10)


	  \psdot(-3,-2)
	  \uput[d](-3,-2){$A$}
	  \psdot(0,3)
	  \uput[u](0,3){$B$}
	  \psdot(4,-1)
	  \uput[d](4,-1){$C$}

	  %\psline[arrowsize=4pt 3]{->}(-5,1)(1,2)
	  %\uput[u](-2,1.5){$\vec{AB}$}
	  %\psline[arrowsize=4pt 3]{->}(-5,1)(-1,-2)
	  %\uput[dl](-3,-0.5){$\vec{AC}$}
	  %\psline[arrowsize=4pt 3]{->}(-5,1)(5,-1)
	  %\uput[u](0,0){$\vec{AD}$}





  \end{pspicture}
