Product of squares eight and nine
ProvedWorkbookCorrected.plus_4695arithmeticcorrectedelementaryworkbook
The elementary natural-number / rational identity
holds by direct arithmetic evaluation.
Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_4695, 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_4695 (Apache-2.0).
Preamble
import Mathlib.Data.Nat.Basic import Mathlib.Tactic.NormNum
Formal statement
theorem WorkbookCorrected.plus_4695 : (8 : ℕ) ^ 2 * 9 ^ 2 = 5184 := by sorry
Source