lean_workbook_plus_45074

Proved

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

How do we know $7^{4}\equiv 1\bmod{5}$ ?

Preamble

import Mathlib.Analysis.Complex.Basic

Formal statement

theorem lean_workbook_plus_45074 : 7 ^ 4 ≡ 1 [ZMOD 5]   :=  by sorry

Source