lean_workbook_plus_76386

Proved

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

If $a,b,c$ be even, then $a^2+b^2+c^2$ is divisible by $4.$

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_76386 (a b c : ℤ) (h : Even a ∧ Even b ∧ Even c): 4 ∣ a ^ 2 + b ^ 2 + c ^ 2   :=  by sorry

Source