FeynCalc manual (development version)

SDF

SDF[i, j] denotes the SU(N) Kronecker delta with color indices i and j in the fundamental representation. SDF[i,j] is transformed into SUNFDelta[SUNFIndex[i],SUNFIndex[j]] by FeynCalcInternal.

See also

Overview, SUNFDelta.

Examples

SDF[a, b]

\delta _{ab}

SDF[a, b] // FCI // StandardForm

(*SUNFDelta[SUNFIndex[a], SUNFIndex[b]]*)

SDF[a, b] // FCE // StandardForm

(*SDF[a, b]*)