Prove2Me

The norm of twice a specified real number

Proved
WorkbookSource.problem_47459

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

lean-workbooksource-checked

So k=−11−372k=-11-\frac{37}2 and ∣2k∣=59\boxed{|2k|=59}

Source: InternLM Lean-Workbook, record lean_workbook_47459 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble
import Mathlib
open Real Nat
Formal statement
theorem WorkbookSource.problem_47459 (k : ℝ) (h : k = -11 - 37 / 2) : ‖2 * k‖ = 59  :=  by sorry
Source
https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_47459; Apache-2.0

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