CY wrote :
> If you mean explicitly enter the +- operator... I'm not sure if Maxima
> defines that one. Anybody know?
We can do :
(%i1) prefix("(+-)");
(%o1) "(+-)"
(%i2) (+-)(x):=[x,-x];
(%o2) (+-) x := [x, - x]
(%i3) (+-)(a+b);
(%o3) [b + a, - b - a]
Laurent