`BookProof.QgCouplingDGammaSum.creVec_single` (k : ℕ) (z : ℂ) (x : FockAlg) : creVec (Finsupp.single k z) x = z • creA k x

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`BookProof.QgCouplingDGammaSum.creVec_single` (k : ℕ) (z : ℂ) (x : FockAlg) : creVec (Finsupp.single k z) x = z • creA k x · Prove2Me