lean_workbook_plus_33783

Proved

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

Prove that $f(x) = x^2$ is continuous at $x = 3$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_33783 : ContinuousAt (fun x : ℝ => x^2) 3   :=  by sorry

Source