lean_workbook_plus_35787

Proved

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

$(n+2)^2\geq (n+1)(n+3)\geq(n+1)^2$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_35787 (n : ℕ) : (n + 2) ^ 2 ≥ (n + 1) * (n + 3) ∧ (n + 1) * (n + 3) ≥ (n + 1) ^ 2   :=  by sorry

Source