Recovering two numbers from their sum and difference

Proved

WorkbookSource.problem_16351

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

lean-workbooksource-checked

Solve for $a$ and $b$ : $a + b = 6$ $a - b = 4$

Source: InternLM Lean-Workbook, record lean_workbook_16351 (Apache-2.0). The complete source proposition and explicit variable declarations are preserved.

Preamble

import Mathlib
open Real Nat

Formal statement

theorem WorkbookSource.problem_16351 (a b : ℝ) : a + b = 6 ∧ a - b = 4 ↔ a = 5 ∧ b = 1  :=  by sorry

Source

https://huggingface.co/datasets/internlm/Lean-Workbook/blob/main/lean_workbook.json, record lean_workbook_16351; Apache-2.0

View graph