Name: Vladyslav Shtabovenko (email_not_shown)
Date: 07/03/16-06:06:04 PM Z

Hi,

you need it to install the latest dev version first:

Import["https://raw.githubusercontent.com/FeynCalc/feyncalc/master/install.m"]
InstallFeynCalc[InstallFeynCalcDevelopmentVersion -> True]

and after that restart Mathematica and run the code. Then it should work.

Cheers,
Vladyslav

Am 03.07.2016 um 13:44 schrieb Shaowu zhang:
> Hi,
> I modified according to your operating. the result is still the same result--1/0.
> Please help me see how to solve the problem below, please.Thanks.
> Below:
>
> here were some issues with ApartFF in the stable
> version that were fixed in the development version some time
> ago
> <https://github.com/FeynCalc/feyncalc/commit/1225fe13db977a3b834e4867e7d55aa3d523a5bb>
> <https://github.com/FeynCalc/feyncalc/commit/d48a409bbb887357013cd930644f89cf39b73659>
> <https://github.com/FeynCalc/feyncalc/commit/8e859cbe1c3cb24cd1fb6b717781690baa04f3e3>
> since those fixes also involved changing the default
> behavior of ApartFF (now scaleless integrals are set to zero
> in D-dims) they didn't make it into the stable version.
> With the development version your code works returning
> -(FAD[{q1, m}, -p + q1, {-k - 2 p + q1, m}]/(2 (m^2 - SPD[p, p]))) -
> FAD[{q1, m}, {k + q1, m}, -p + q1]/(2 (m^2 - SPD[p, p])) +
> FAD[{q1, m}, {k + q1, m}, {-2 p + q1, m}]/(m^2 - SPD[p, p])
> Cheers,
> Vladyslav
> Am 01.07.2016 um 15:44 schrieb Shaowu zhang:
>> Hi
>> Could you help me check the code as follows?
>>
>> ScalarProduct[p,p]=m^2
>>
>> ScalarProduct[k,k]=0
>> top=FAD[{q1, m}, {q1 - p}, {q1 - 2 p, m}, {q1 - k - 2 p, m}] // FCI
>> ApartFF[top,q1]
>>
>> Next,the result is "Infinite expression 1/0 encountered."
>> I do not understand the wrong result.
>

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