lean_workbook_plus_37471

Proved

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

$P(2,2): f(2)^2=2f(2)+8 \\implies f(2)=4$ or $f(2)=-2$ .

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_37471 (f : ℤ → ℤ) (h₁ : f 2 ^ 2 = 2 * f 2 + 8) : f 2 = 4 ∨ f 2 = -2   :=  by sorry

Source