`BookProof.TruncationGapLift.exists_galerkin_tail_decomp` (b : HilbertBasis ℕ ℂ F) (m : ℕ) {v : F} (hv : v ∈ finiteModeDomain b) : ∃ x ∈ galerkinSpan b m, ∃ w ∈ tailSpan b m, v = x

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`BookProof.TruncationGapLift.exists_galerkin_tail_decomp` (b : HilbertBasis ℕ ℂ F) (m : ℕ) {v : F} (hv : v ∈ finiteModeDomain b) : ∃ x ∈ galerkinSpan b m, ∃ w ∈ tailSpan b m, v = x · Prove2Me