13.0.7 `poly_initial'
---------------------

poly_initial(I)
     :  It returns the initial ideal of I with respect to the given
     order.

poly_initial(I | ORDER=key0,V=key1)
     : This function allows optional variables   ORDER, V

   Description:

     The optional variable v is a list of variables. This function
     computes


   Example:
      poly_initial([x^2+y^2-4,x*y-1]|order=0,v=[x,y]);

