lean_workbook_plus_65910
Provedprove that
Preamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_65910 (a b c d : ℝ) : (a + b + c + d) ^ 2 ≥ 4 * (a * b + b * c + c * d + d * a) := by sorry
Source
prove that
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_65910 (a b c d : ℝ) : (a + b + c + d) ^ 2 ≥ 4 * (a * b + b * c + c * d + d * a) := by sorry