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FeynCalc 4.2.0
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Cosmetics:
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Keep things compact:
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We use k1 and k2 for the indices with 7 values - 3 SU(2) and 4 Lorentz values.
![projectionRules = {HoldPattern[KroneckerDelta[LorentzIndex[μ_], SUNIndex[j_]] UMatrix[UGenerator[SUNIndex[j_]]]] -> 0, HoldPattern[KroneckerDelta[LorentzIndex[μ_], SUNIndex[j_]] NM[___, UMatrix[UGenerator[SUNIndex[j_]]], ___]] -> 0, HoldPattern[KroneckerDelta[LorentzIndex[μ_], SUNIndex[j_]] UTrace1[NM[___, UMatrix[UGenerator[SUNIndex[j_]]], ___]]] -> 0, UMatrix[UGenerator[LorentzIndex[_]]] -> 0, KroneckerDelta[LorentzIndex[_], SUNIndex[_]]^2 -> 4} ;](HTMLFiles/index_17.gif)
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![test1 = CovariantNabla[HRight[x], x, {μ}] /. $Substitutions /. {GRight[LorentzIndex[mu_]] -> GRight[mu], GLeft[LorentzIndex[mu_]] -> GLeft[mu]} // NMExpand // Expand // UReduce](HTMLFiles/index_19.gif)

![test2 = Collect[ I/2 UCommutator[USmall[μ][x], HLeft[x]] + NM[Adjoint[SMM[x]], CQRight[μ][x], SMM[x]] + NM[SMM[x], CQLeft[μ][x], Adjoint[SMM[x]]] /. $Substitutions /. CovariantFieldDerivative[a_, x_, mu_] :> (FieldDerivative[a, x, {μ}] - I NM[GRight[μ][x], a] + I NM[a, GLeft[μ][x]]) /. MM[x] -> NM[SMM[x], SMM[x]] // NMExpand // Expand // UReduce, _NM]](HTMLFiles/index_21.gif)

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![test1 = CovariantNabla[HLeft[x], x, {μ}] /. $Substitutions /. {GRight[LorentzIndex[mu_]] -> GRight[mu], GLeft[LorentzIndex[mu_]] -> GLeft[mu]} // NMExpand // Expand // UReduce](HTMLFiles/index_25.gif)

![test2 = Collect[ I/2 UCommutator[USmall[μ][x], HRight[x]] + NM[Adjoint[SMM[x]], CQRight[μ][x], SMM[x]] - NM[SMM[x], CQLeft[μ][x], Adjoint[SMM[x]]] /. $Substitutions /. CovariantFieldDerivative[a_, x_, mu_] :> (FieldDerivative[a, x, {μ}] - I NM[GRight[μ][x], a] + I NM[a, GLeft[μ][x]]) /. MM[x] -> NM[SMM[x], SMM[x]] // NMExpand // Expand // UReduce, _NM]](HTMLFiles/index_27.gif)

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Converted by Mathematica (July 10, 2003)