On Sun, 29 Jul 2001, Do Hoang Son wrote:
........> 
> It returns:
> -m2*p1\-p1\*p2\-m2*ONE*m1-p2\*m1 
> 
> The correct one should be:
> m2*p1\-p1\*p2\+m2*ONE*m1+p2\*m1 
                         ^^^^^
Sorry, it shold be 
m2*p1\-p1\*p2\+m2*ONE*m1 - p2\*m1
                       ^^^^^
So*n.