GAD[mu]
can be used as input for a -dimensional and is transformed into DiracGamma[LorentzIndex[mu,D],D]
by FeynCalcInternal
(=FCI
).
GAD[mu , nu , ...]
is a short form for GAD[mu].GAD[nu]
.
Overview, DiracGamma, GA, GS.
[\[Mu]] GAD
[\[Mu], \[Nu]] - GAD[\[Nu], \[Mu]] GAD
StandardForm[FCI[GAD[\[Mu]]]]
(*DiracGamma[LorentzIndex[\[Mu], D], D]*)
[\[Mu], \[Nu], \[Rho], \[Sigma]] GAD
StandardForm[GAD[\[Mu], \[Nu], \[Rho], \[Sigma]]]
(*GAD[\[Mu]] . GAD[\[Nu]] . GAD[\[Rho]] . GAD[\[Sigma]]*)
[\[Alpha]] . (GSD[p] + m) . GAD[\[Beta]] GAD