CGSD[p]
is transformed into DiracGamma[CartesianMomentum[p, D-1], D]
by FeynCalcInternal
.
CGSD[p,q, ...]
is equivalent to CGSD[p].CGSD[q]
.
[p] CGSD
[p] // FCI // StandardForm
CGSD
(*DiracGamma[CartesianMomentum[p, -1 + D], D]*)
[p, q, r, s] CGSD
[p, q, r, s] // StandardForm
CGSD
(*CGSD[p] . CGSD[q] . CGSD[r] . CGSD[s]*)
[q] . (CGSD[p] + m) . CGSD[q] CGSD