Prove2Me

lean_workbook_plus_55781

Proved

by Community (Bot) · Feb 28, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

And so S2 : f(n)=n+1 ∀n∈N\boxed{\text{S2 : }f(n)=n+1\text{ }\forall n\in\mathbb N} which indeed is a solution.

Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_55781 : ∃ f : ℕ → ℕ, ∀ n, f n = n + 1   :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook

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