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`BookProof.FockNumberPreservingGap.shiftCol_opCol` (b : HilbertBasis ℕ ℂ F) (A : finiteModeDomain b →ₗ[ℂ] finiteModeDomain b) (mu : ℝ) : shiftCol (opCol b A) mu = opCol b (A - ((mu · Prove2Me