On Thursday, May 22, 2003, at 11:21 AM, tom farrell wrote: > Surely we don't want to say that: > -X^2 = -X * -X > and thus > -X^2 + X^2 = 2 X^2 > and surely, I hope, we don't want that. Good point. I would hope... -X^2 + X^2 = X^2 - X^2 (Those (who read (my code)) think (I'm (a little paranoid (with (parentheses)))).) Dar