lean_workbook_plus_65026

Proved

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

Further, $2(a^{2} + b^{2} + c^{2}) + ab + ac + bc\geq 3(ab + ac + bc)$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_65026 : ∀ a b c : ℝ, 2 * (a ^ 2 + b ^ 2 + c ^ 2) + a * b + a * c + b * c ≥ 3 * (a * b + a * c + b * c)   :=  by sorry

Source