`BookProof.ChapterEulerNState.tailSum_last` (p : ℕ → ℝ) {n : ℕ} (hn : 1 ≤ n) : tailSum p n (n - 1) = p (n - 1)

Proved

BookProof.ChapterEulerNState.tailSum_last

by leonardopedro · Oct 8, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterEulerNState.

BookProof.ChapterEulerNState.tailSum_last (p : ℕ → ℝ) {n : ℕ} (hn : 1 ≤ n) : tailSum p n (n - 1) = p (n - 1)

Formalization note: Lean 4 identifier BookProof.ChapterEulerNState.tailSum_last.

Preamble

-- Generated from ChapterEulerNState.lean — theorem BookProof.ChapterEulerNState.tailSum_last
import Mathlib
import Definitions.Def_ChapterEulerNState
open BookProof.ChapterEulerNState


open scoped BigOperators

Formal statement

theorem BookProof.ChapterEulerNState.tailSum_last (p : ℕ → ℝ) {n : ℕ} (hn : 1 ≤ n) :
    tailSum p n (n - 1) = p (n - 1) := by sorry

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