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Update CreateAnnihilateSection.lean

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Pietro Monticone 2025-01-14 00:00:39 +01:00
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HepLean/PerturbationTheory/Wick/CreateAnnihilateSection.lean
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@ -16,7 +16,7 @@ open FieldStatistic
/-- The sections of `Σ i, f i` over a list `φs : List 𝓕`.
In terms of physics, given some fields `φ₁...φₙ`, the different ways one can associate
each field as a `creation` or an `annilation` operator. E.g. the number of terms
each field as a `creation` or an `annihilation` operator. E.g. the number of terms
`φ₁⁰φ₂¹...φₙ⁰` `φ₁¹φ₂¹...φₙ⁰` etc. If some fields are exclusively creation or annihilation
operators at this point (e.g. asymptotic states) this is accounted for. -/
def CreateAnnihilateSect {𝓕 : Type} (f : 𝓕 → Type) (φs : List 𝓕) : Type :=