Luis,

I get:

sage: ...
sage: a=3*e2*e1 + 4*e1
sage: a

            2
  4x e  - 3x e e
      1       1 2

---

I notice you are using sage-3.1.4. That should be fine. In the example
above I am using 3.1.3 but it includes the patches done by Mike Hansen

http://trac.sagemath.org/sage_trac/ticket/4036

that are not yet in the Sage distribution (review needed). See also

http://trac.sagemath.org/sage_trac/ticket/4633

The error message you show seems typical of the problems that these
patches solve.

Regards,
Bill Page.

On Sat, Jan 17, 2009 at 9:47 AM, luis wrote:
>
> Hi Bill,
>
> Thanks for your answer. Yes, it seems to be a good answer
> to my question.
> I have however a problem. The error message is included
> below. Do you have some idea?
>
> Regards,
>
> Luis
>
> ------
> ....
> sage: e1=axiom('x*e(1)$%s'%(LambdaK.name()))
> sage: e2=axiom('x*e(2)$%s'%(LambdaK.name()))
> sage: e3=axiom('x*e(3)$%s'%(LambdaK.name()))
> sage: e4=axiom('x*e(4)$%s'%(LambdaK.name()))
> sage: a=3*e2*e1 + 4*e1
> ---------------------------------------------------------------------------
> TypeError                                 Traceback (most recent call
> last)
>
> /home/luis/sage-3.1.4-debian32-IntelXeon-x86-i686-Linux/<ipython
> console> in <mo dule>()
>
> /home/luis/sage-3.1.4-debian32-IntelXeon-x86-i686-Linux/local/lib/
> python2.5/site -packages/sage/structure/element.so in
> sage.structure.element.RingElement.__mul_ _ (sage/structure/element.c:
> 8187)()
>
> /home/luis/sage-3.1.4-debian32-IntelXeon-x86-i686-Linux/local/lib/
> python2.5/site -packages/sage/structure/coerce.so in
> sage.structure.coerce.CoercionModel_cache_ maps.bin_op (sage/structure/
> coerce.c:5559)()
>
> TypeError: unsupported operand parent(s) for '*': 'Integer Ring' and
> 'Axiom'
>

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