Elementary arithmetic identity #19389
ProvedWorkbookCorrected.plus_19389arithmeticcorrectedelementaryrepairedworkbook
The elementary natural-number identity
holds by direct arithmetic evaluation.
Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_19389, which omitted a compilable colon/type annotation and/or used a preamble of only Mathlib.Analysis.Complex.Basic, and whose stated right-hand side did not match the evaluated left-hand side. The repaired statement keeps the arithmetic left-hand side and uses the evaluated integer right-hand side (original RHS was 168081).
Source: InternLM Lean-Workbook, record lean_workbook_plus_19389 (Apache-2.0).
Preamble
import Mathlib.Tactic.NormNum
Formal statement
theorem WorkbookCorrected.plus_19389 : 1 + 20 + 400 + 8000 + 160000 = 168421 := by sorry
Source