Prove2Me

An exact integer calculation

Proved
WorkbookSource.problem_28974

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

lean-workbooksource-checked

Calculate 23×4−1−523\times4 - 1 - 5

Source: InternLM Lean-Workbook, record lean_workbook_28974 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble
import Mathlib
open Real Nat
Formal statement
theorem WorkbookSource.problem_28974 : 23 * 4 - 1 - 5 = 86  :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_28974; Apache-2.0

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