lean_workbook_plus_63931

Proved

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

The difference between $n^2$ and $1$ is $n^2-1$ , or $(n+1)(n-1)$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_63931  (n : ℕ) :
  n^2 - 1 = (n + 1) * (n - 1)   :=  by sorry

Source