FeynCalc manual (development version)

SUNIndex

SUNIndex[a] is an SU(N) index in the adjoint representation. If the argument is an integer, SUNIndex[a] turns into ExplicitSUNIndex[a].

See also

Overview, ExplicitSUNIndex, SUNDelta, SUNF.

Examples

SUNIndex[i]

i

SUNIndex[i] // StandardForm

(*SUNIndex[i]*)
SUNIndex[2]

2

SUNIndex[2] // StandardForm

(*ExplicitSUNIndex[2]*)
SUNDelta[i, j] // FCI // StandardForm

(*SUNDelta[SUNIndex[i], SUNIndex[j]]*)