lean_workbook_plus_76336

Proved

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

b) A closed subset of $[a,b]$ is compact.

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_76336 (a b : ℝ) (hab : a ≤ b) (s : Set ℝ) (hs : a ≤ b ∧ b ≤ a) : IsClosed s → s ⊆ Set.Icc a b → IsCompact s   :=  by sorry

Source