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PhysLean.QFT.PerturbationTheory.FieldOpFreeAlgebra.SuperCommute

Super Commute #

The super commutator on the FieldOpFreeAlgebra. #

For a field specification 𝓕, the super commutator superCommuteF is defined as the linear map 𝓕.FieldOpFreeAlgebra →ₗ[ℂ] 𝓕.FieldOpFreeAlgebra →ₗ[ℂ] 𝓕.FieldOpFreeAlgebra which on the lists φs and φs' of 𝓕.CrAnFieldOp gives

superCommuteF φs φs' = φs * φs' - 𝓢(φs, φs') • φs' * φs.

The notation [a, b]ₛF can be used for superCommuteF a b.

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    For a field specification 𝓕, the super commutator superCommuteF is defined as the linear map 𝓕.FieldOpFreeAlgebra →ₗ[ℂ] 𝓕.FieldOpFreeAlgebra →ₗ[ℂ] 𝓕.FieldOpFreeAlgebra which on the lists φs and φs' of 𝓕.CrAnFieldOp gives

    superCommuteF φs φs' = φs * φs' - 𝓢(φs, φs') • φs' * φs.

    The notation [a, b]ₛF can be used for superCommuteF a b.

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    • One or more equations did not get rendered due to their size.
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      The super commutator of different types of elements #

      Mul equal superCommuteF #

      Lemmas which rewrite a multiplication of two elements of the algebra as their commuted multiplication with a sign plus the super commutator.

      Symmetry of the super commutator. #

      Splitting the super commutator on lists into sums. #

      For a field specification 𝓕, and two lists φs = φ₀…φₙ and φs' of 𝓕.CrAnFieldOp the following super commutation relation holds:

      [φs', φ₀…φₙ]ₛF = ∑ i, 𝓢(φs', φ₀…φᵢ₋₁) • φ₀…φᵢ₋₁ * [φs', φᵢ]ₛF * φᵢ₊₁ … φₙ

      The proof of this relation is via induction on the length of φs.

      Interaction with grading. #