Name: Vladyslav Shtabovenko (email_not_shown)
Date: 07/04/16-11:17:43 PM Z


Hi,

sorry, I apparently at first overlooked the

ScalarProduct[p,p]=m^2

line. Now I see it that is indeed a bug. Thanks for reporting,
should be now fixed:

<https://github.com/FeynCalc/feyncalc/commit/329d5d2d6c5d9f3e09bff9467b7c3dfbb566876d>

Please reinstall the development version and try again.

Cheers,
Vladyslav

Am 03.07.2016 um 18:06 schrieb Vladyslav Shtabovenko:
> 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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