DiracSimplify[GA[\[Alpha]].(GS[p] + m).GA[\[Alpha]]] gives needed result.
Regards, Dimitry Fedorov.
----- Original Message -----
From: "hrchang" <firstname.lastname@example.org>
Sent: Sunday, December 20, 2009 4:18 PM
Subject: Contractions of Gamma matrices with each other
> I wonder how to use mathematica to calculate the contractions of Gamma
> matrices with each other, such as GA[\[Alpha]].(GS[p]+m).GA[\[Alpha]].
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