lean_workbook_plus_2717
ProvedProve .
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_2717 {a b c : ℝ} : (a + b + c) ^ 2 ≥ 3 * (a * b + b * c + a * c) := by sorrySource
Prove .
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_2717 {a b c : ℝ} : (a + b + c) ^ 2 ≥ 3 * (a * b + b * c + a * c) := by sorry