lean_workbook_plus_15193

Proved

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

Find a function $f : \mathbb{R} \rightarrow \mathbb{R}$ that satisfies $f(x) = x^3$ and check if it fits the original equation.

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_15193 (f : ℝ → ℝ) (hf: f = fun x => x^3) : ∀ x, f x = x^3   :=  by sorry

Source