lean_workbook_plus_50546

Proved

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

So $f(m)=m,\forall m\in \mathbb{N}$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_50546 : ∃ f : ℕ → ℕ, ∀ m, f m = m   :=  by sorry

Source