lean_workbook_plus_30053

Disproved

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

Use this: $a^3+b^3+c^3=(a+b+c)(a^2+b^2+c^2-ab-ac-bc)$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_30053 : ∀ a b c : ℝ, a^3 + b^3 + c^3 - (a + b + c) * (a^2 + b^2 + c^2 - a * b - a * c - b * c) = 0   :=  by sorry

Source