Binomial coefficient identity #43736
ProvedWorkbookCorrected.plus_43736arithmeticcorrectedelementaryrepairedworkbook
The elementary natural-number identity
holds by direct arithmetic evaluation.
Formalization Note: This corrects Lean-Workbook record lean_workbook_plus_43736, 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 combinatorial/arithmetic left-hand side and uses the evaluated integer right-hand side (original RHS was 330).
Source: InternLM Lean-Workbook, record lean_workbook_plus_43736 (Apache-2.0).
Preamble
import Mathlib.Data.Nat.Choose.Basic import Mathlib.Tactic.NormNum
Formal statement
theorem WorkbookCorrected.plus_43736 : ((Nat.choose 12 5)) = 792 := by sorry
Source