Factorial arithmetic identity #29299
ProvedWorkbookCorrected.plus_29299arithmeticcorrectedelementaryworkbook
The elementary natural-number / rational identity
holds by direct arithmetic evaluation.
Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_29299, 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_29299 (Apache-2.0).
Preamble
import Mathlib.Data.Nat.Factorial.Basic import Mathlib.Tactic.NormNum
Formal statement
theorem WorkbookCorrected.plus_29299 : (Nat.factorial 8) + (Nat.factorial 9) + (Nat.factorial 10) = 4032000 := by sorry
Source