lean_workbook_plus_5364

Proved

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

Show that any infinite subset of $\mathbb{N}$ can be bijectively mapped to $\mathbb{N}$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_5364 (s : Set ℕ) (h : s.Infinite) :
    ∃ f : ℕ → ℕ, Function.Bijective f   :=  by sorry

Source