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@ihep.ac.cn
>　　　　　　　　　　2004-12-02
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