`BookProof.TruncationGapLift.galerkinSpan_sup_tailSpan` (b : HilbertBasis ℕ ℂ F) (m : ℕ) : galerkinSpan b m ⊔ tailSpan b m = finiteModeDomain b

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`BookProof.TruncationGapLift.galerkinSpan_sup_tailSpan` (b : HilbertBasis ℕ ℂ F) (m : ℕ) : galerkinSpan b m ⊔ tailSpan b m = finiteModeDomain b · Prove2Me