
                                %Derivatives%

        Derivatives consist of the highlighted %D% character (which is
   accessed by Ctrl D on the keyboard) followed by a list of differentials
   and their orders enclosed in square brackets and then followed by an
   argument.  Optional evaluation points may be specified.

   %Examples%

   %D%[x|2, y|3](f(x,y))@(x=0,y=1)
   %D%[x](g(x))

   %Usage%

   þDQ : %D%[x|2](g(x)) + 2*b*%D%[x](g(x)) + g(x) = 0

