normal()

[Dirk Kreimer]

Hi there,

upon realizing that Christian's denominator below
is (q1-q2)^2*q2^2, and that q10+q21=(q1^2+q1\cdot q2)/q10,
it is actually easy to verify that his result
and Do Hoang Son's agree, upon further setting rho=0 in the numerator
in Christian's result.

So normal should see that in this limit, after a bit massage?

Herzliche Gruesse aus Harvard,

Dirk




Christian Bauer wrote:

> Hi!
>
> On Wed, 20 Oct 1999, Do Hoang Son wrote:
> > coeff(series(OneLoop3Pt(3,0,0,q10,q20,q21,m1,m2,m3),eps,3),eps,-1); !!!
> >
> > This result if be simplified by simplify() of Maple gives
> > -1/4*I*Pi(q10+q20) as expected
>
> Hm... I get
>
>                3    2          3    2          2    3          2    2
> - 1/12 (3 I q10  q20  - 3 I q10  q21  - 3 I q10  q20  + 3 I q10  q21  q20
>
>               4                2              4          5          2   3
>  - 3 I q10 q20  + 2 q10 rho q21  + 3 I q10 q21  + 3 I q20  - 6 I q21 q20
>
>                   2              4    2   /
>    - 4 q20 rho q21  + 3 I q20 q21 ) Pi   /  (
>                                         /
>
>                      2      2      2       2      2
>     (-2 q20 q10 - q21  + q10  + q20 ) (-q21  + q20 ))
>
> !?
>
> Bye,
> Christian
>
> --
>   / Coding on PowerPC and proud of it
> \/ http://www.uni-mainz.de/~bauec002/