
 a) Verify with numeric applications some properties. 
    
 b) The coefficients, are randomly selected by the computer.

 c) To see the result in Gnuplot (gp373w32.exe) :          

    * open the file ****.plt with Gnuplot.  => Gnuplot draw u and v. 
    * Press Return in Dos Windows.          => To create a new value for u.
    * Use the command Replot in Gnuplot.    => To draw the news u and v.

 
   Try the examples in this order.


    The xy-plan : (a11xy.plt)
    ===========

        Orthogonal projection on the xy-plan (OA) : a11xya.c
        Orthogonal projection on the xy-plan (AB) : a11xyb.c

                Reflection about the xy-plan (OA) : a11xyc.c
                Reflection about the xy-plan (AB) : a11xyd.c

  
     The xz-plan : (b22xz.plt)
     ===========

        Orthogonal projection on the xz-plan (OA) : b22xza.c
        Orthogonal projection on the xz-plan (AB) : b22xzb.c

                Reflection about the xz-plan (OA) : b22xzc.c
                Reflection about the xz-plan (AB) : b22xzd.c 


     The yz-plan : (c33yz.plt)
     ===========

        Orthogonal projection on the xz-plan (OA) : c33yza.c
        Orthogonal projection on the xz-plan (AB) : c33yzb.c

                Reflection about the xz-plan (OA) : c33yzc.c
                Reflection about the xz-plan (AB) : c33yzd.c 




