lean_workbook_plus_1852

Proved

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

$\boxed{\text{S2 : }f(x)=x^2+a\quad\forall x}$ which indeed is a solution, whatever is $a\in\mathbb R$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_1852 (a : ℝ) (f : ℝ → ℝ) (hf: f = fun x ↦ x^2 + a) : (∀ x, f x = x^2 + a)   :=  by sorry

Source