lean_workbook_plus_33106

Proved

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

And it is equivalent to $(a^2 + b^2)^2 + c^2(a + b)^2 \ge 2c(a^2 + b^2)(a + b)$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_33106 : ∀ a b c : ℝ, (a^2 + b^2)^2 + c^2 * (a + b)^2 ≥ 2 * c * (a^2 + b^2) * (a + b)   :=  by sorry

Source