LeftRightPartialD2
LeftRightPartialD2[mu]
denotes ∂μ, acting to the left and right.
ExplicitPartialD[LeftRightPartialD2[mu]]
gives (RightPartialD[mu] + LeftPartialD[mu])
.
See also
Overview, ExplicitPartialD, ExpandPartialD, FCPartialD, LeftPartialD, RightPartialD.
Examples
LeftRightPartialD2[\[Mu]]
ExplicitPartialD[%]
∂μ
∂μ+∂μ
LeftRightPartialD2[\[Mu]] . QuantumField[A, LorentzIndex[\[Nu]]]
ExpandPartialD[%]
∂μ.Aν
(∂μAν)+∂μ.Aν
QuantumField[A, LorentzIndex[\[Mu]]] . LeftRightPartialD2[\[Nu]] . QuantumField[A, LorentzIndex[\[Rho]]]
ExpandPartialD[%]
Aμ.∂ν.Aρ
Aμ.((∂νAρ))+((∂νAμ)).Aρ