lean_workbook_plus_38009
ProvedPreamble
import Mathlib.Analysis.Complex.Basic
Formal statement
theorem lean_workbook_plus_38009 (a b c d : ℝ) : Real.sqrt ((a^2 + d^2) * (b^2 + c^2)) ≥ a * c + b * d := by sorry
Source
import Mathlib.Analysis.Complex.Basic
theorem lean_workbook_plus_38009 (a b c d : ℝ) : Real.sqrt ((a^2 + d^2) * (b^2 + c^2)) ≥ a * c + b * d := by sorry