GSD[p] can be used as input for a -dimensional and is transformed into DiracGamma[Momentum[p,D],D]
by FeynCalcInternal
(=FCI
).
GSD[p,q, ...]
is a short form for GSD[p].GSD[q]
.
Overview, DiracGamma, GA, GAD.
[p] GSD
[p] // FCI // StandardForm
GSD
(*DiracGamma[Momentum[p, D], D]*)
[p, q, r, s] GSD
[p, q, r, s] // StandardForm
GSD
(*GSD[p] . GSD[q] . GSD[r] . GSD[s]*)
[q] . (GSD[p] + m) . GSD[q] GSD