[Axiom-mail] complex numbers

[Andrea Bedini]

Hi,
I'm just learning how to do some computations with Axiom, but I've a
problem with complex numbers.

Why this evalutate to zero ?

(199) -> A: Complex Polynomial Integer
                                                                   Type: Void
(200) -> A*conjugate A - A^2

   (200)  0
                                             Type: Complex Polynomial Integer

this is not true in general

(202) -> A := a+%i*b

   (202)  a + b %i
                                             Type: Complex Polynomial Integer
(203) -> A*conjugate A - A^2

            2
   (203)  2b  - 2a b %i
                                             Type: Complex Polynomial Integer

Anybody can give me some hints ?

-- 
Andrea Bedini