lean_workbook_plus_5659

Proved

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

Prove that $2y^2 + 2z^2 \ge 4yz$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_5659 (y z : ℝ) : 2 * y ^ 2 + 2 * z ^ 2 ≥ 4 * y * z   :=  by sorry

Source