Prove2Me

An exact factorial expression

Proved
WorkbookSource.problem_56692

by wamlart · Sep 12, 2026 · Mathlib 0df444a (Lean v4.33.1)

lean-workbooksource-checked

Calculate 3!×4×52−1\frac {3!\times4\times5}{2} - 1

Source: InternLM Lean-Workbook, record lean_workbook_56692 (Apache-2.0). The complete source proposition and its explicit variable declarations are preserved.

Preamble
import Mathlib
open Real Nat
Formal statement
theorem WorkbookSource.problem_56692 : 3! * 4 * 5 / 2 - 1 = 59  :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_56692; Apache-2.0

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