lean_workbook_plus_19502
Provedprove that
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_19502 {a b c : ℝ} : (a + b + c) ^ 2 ≥ 3 * (a * b + b * c + c * a) := by sorrySource
prove that
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_19502 {a b c : ℝ} : (a + b + c) ^ 2 ≥ 3 * (a * b + b * c + c * a) := by sorry