LeftRightPartialD2

Description

LeftRightPartialD2[mu] denotes (Subscript[(∂^ ↔) , μ]), acting to the left and right. ExplitPartialD[LeftRightPartialD2[μ]] gives (RightPartialD[μ] + LeftPartialD[μ]).

See also:  ExplicitPartialD, ExpandPartialD, PartialD, LeftPartialD, RightPartialD.

Examples

LeftRightPartialD2[μ]

ExplicitPartialD[%]

LeftRightPartialD2[μ] . 
      QuantumField[A, LorentzIndex[ν]]

ExpandPartialD[%]

QuantumField[A, LorentzIndex[μ]] . LeftRightPartialD2[ν] . 
      QuantumField[A, LorentzIndex[ρ]]

ExpandPartialD[%]