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

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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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• Next message: Matt: “Re: installation on mac os”
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