Factorial arithmetic identity #81110
ProvedWorkbookCorrected.plus_81110arithmeticcorrectedelementaryworkbook
The elementary natural-number / rational identity
holds by direct arithmetic evaluation.
Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_81110, which omitted a compilable colon/type annotation and/or used a preamble of only Mathlib.Analysis.Complex.Basic.
Source: InternLM Lean-Workbook, record lean_workbook_plus_81110 (Apache-2.0).
Preamble
import Mathlib.Data.Nat.Factorial.Basic import Mathlib.Tactic.NormNum
Formal statement
theorem WorkbookCorrected.plus_81110 : 8 * (Nat.factorial 10) * (Nat.factorial 2) = 8 * (Nat.factorial 10) * (Nat.factorial 2) := by sorry
Source