lean_workbook_plus_32327

Proved

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

| $\overrightarrow{u}$ |+| $\overrightarrow{v}$ | $\ge$ | $\overrightarrow{u}+\overrightarrow{v}$ |

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_32327 (u v : ℝ × ℝ) : ‖u‖ + ‖v‖ ≥ ‖u + v‖   :=  by sorry

Source