lean_workbook_plus_63713

Proved

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

Prove that $5^n +9<6^n$ for all $n\geq2$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_63713 (n : ℕ) (hn : 2 ≤ n) : 5^n + 9 < 6^n   :=  by sorry

Source