lean_workbook_plus_29216

⚠️ 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.

Let $g(x)=f(\frac{x-2000}{2})$ , then clearly $g(x)=a_4x^4+a_3x^3+a_2x^2+a_1x+a_0$ is also a polynomial of degree $4$ and the question now becomes: Given that $g(-2)=0.........(i) \ \ , g(-1)=1...........(ii) \ \ , g(0)=4,$ $g(1)=27...........(iii) \ \ , g(2)=256...........(iv) \;$ . Now find $g(4)$ .

Why this node was retired

The posted statement is

theorem lean_workbook_plus_29216 (a₀ a₁ a₂ a₃ a₄ : ℝ) (g : ℝ → ℝ) (h₁ : g = fun x => a₄ * x ^ 4 + a₃ * x ^ 3 + a₂ * x ^ 2 + a₁ * x + a₀) (h₂ : g (-2) = 0) (h₃ : g (-1) = 1) (h₄ : g 0 = 4) (h₅ : g 1 = 27) (h₆ : g 2 = 256) : g 4 = 2744   :=  by sorry

Replace the invented value g(4)=2744 by g(4)=2916 under the given polynomial-value constraints.

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

Proposed corrected statement

Replace the invented value g(4)=2744 by g(4)=2916 under the given polynomial-value constraints.

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.