Name: rolf_at_HIDDEN-E-MAIL Date: 12/08/04-11:45:15 PM Z
Dear Jinghantao,
yes, unfortunately there is a bug right now when calling
Tr directly on on unsimplified noncommutative expressions.
Please use DiracSimplify or Calc first.
E.g., defining
tr = TR[Calc[#]]& ;
and using tr instead of TR will give the correct result
for calculating traces.
Regards,
Rolf Mertig
GluonVision GmbH
Berlin
Germany
>feyncalc，hello
> when i use trace fuction to calculate the
>expression:Tr[(GA[j].GS[q] -
GS[q].GA[j]).(GA[i].GS[q] -
>GS[q].GA[i])],the result is null. But for the
>expression:Tr[DiracSimplify[(GA[j].GS[q] -
>GS[q].GA[j]).(GA[i].GS[q] -
GS[q].GA[i])]],the result isnot >null,
furthermore, the second expression’s result is the same >to my
manuscript. why? Could you give me some help? thanks >very much.
>
> jinghantao
> [jinght_at_HIDDEN-E-MAIL]
> 2004-12-02