lean_workbook_plus_8569

⚠️ Retired — specification defect

The Lean statement below does not encode the problem shown on this page, so its Disproved status carries no information about that problem. Do not import this node or use it as a dependency.

Prove that, the equation $(x+y)(x+y-6)=xy$ has no solutions for distinct $x$ and $y$ in positive integers.

Why this node was retired

The posted statement is

theorem lean_workbook_plus_8569 (x y : ℕ) (h₀ : x ≠ y) (h₁ : (x + y) * (x + y - 6) = x * y) : False   :=  by sorry

The source positive integer restrictions were omitted and natural subtraction creates zero products when x+y<6.

The recorded counterexample refutes the statement as encoded. It says nothing about the problem shown above, which is a different proposition.

Proposed corrected statement

Require x,y≥1 and use integer equation(x+y)(x+y−6)=xy, then prove the claimed nonexistence for x≠y.

Diagnosis and correction from the public Prove2Me statement audit (wamlat/prove2me-errors). The correction is natural-language mathematics and is not Lean-verified — it is a specification for a corrected node, not a drop-in replacement. No corrected replacement node exists yet.