`BookProof.ChapterEulerNState.tailSum_zero_eq` (p : ℕ → ℝ) (n : ℕ) : tailSum p n 0 = ∑ j ∈ Finset.range n, p j

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`BookProof.ChapterEulerNState.tailSum_zero_eq` (p : ℕ → ℝ) (n : ℕ) : tailSum p n 0 = ∑ j ∈ Finset.range n, p j · Prove2Me