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`BookProof.FockNumberPreservingGap.dGamma_shiftCol` (col : ℕ → (ℕ →₀ ℂ)) (mu : ℝ) (u : FockAlg) : dGamma (shiftCol col mu) u = dGamma col u - ((mu : ℝ) : ℂ) • dGamma numberCol u · Prove2Me