lean_workbook_plus_21262

Disproved

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

prove $abc(xy+yz+zx)\ge xyz(ab+bc+ca)$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_21262 : ∀ a b c x y z : ℝ, a * b * c * (x * y + y * z + z * x) ≥ x * y * z * (a * b + b * c + c * a)   :=  by sorry

Source