Elementary arithmetic identity #50061
ProvedWorkbookCorrected.plus_50061arithmeticcorrectedelementaryworkbook
The elementary natural-number / rational identity
holds by direct arithmetic evaluation.
Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_50061, 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_50061 (Apache-2.0).
Preamble
import Mathlib.Tactic.NormNum
Formal statement
theorem WorkbookCorrected.plus_50061 : 210 - 80 = 130 := by sorry
Source