6.3.13 `ediff'
--------------

ediff(POLY[,VARN]*)

ediff(POLY,VARLIST)
     :: Differentiate POLY successively by Euler operators of VAR's for
     the first form, or by Euler operators of variables in VARLIST for
     the second form.

RETURN
     polynomial

POLY
     polynomial

VARN
     indeterminate

VARLIST
     list of indeterminates

   * differentiation is performed by the specified indeterminates
     (variables) from left to right.  ediff(POLY,x,y) is the same as
     ediff(ediff(POLY,x),y).

     [0] ediff((x+2*y)^2,x);
     2*x^2+4*y*x
     [1] ediff((x+2*y)^2,x,y);
     4*y*x

