Name: Rolf Mertig (email_not_shown)
Date: 09/07/09-03:15:05 PM Z


Hi,
there is no bug. You use an incorrect input syntax.
You need to use:
Tr[GA[a].GA[c].GA[b].GA[d]]
since only the dot gives you a non-commutative multiplication.

Please see als:
http://www.feyncalc.org/FeynCalcBook/Tr/

Regards,
Rolf Mertig
http://www.gluonvision.com



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