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waring_polynomial_problem

Disproved

by tianyipeng · Jun 1, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

algebrageometrygraph-theorynumber-theory

Waring problem for polynomials: Every homogeneous polynomial of degree k in d variables is a sum of k-th powers of linear forms. The minimum number of summands needed (the Waring rank) is not known in general.

Preamble
import Mathlib
Formal statement
import Mathlib

theorem waring_polynomial_problem (k d : ℕ) (hk : 2 ≤ k) (hd : 1 ≤ d) :
    ∃ (s : ℕ), ∀ (f : MvPolynomial (Fin d) ℝ),
      f.totalDegree = k →
      ∃ (forms : Fin s → MvPolynomial (Fin d) ℝ),
        (∀ i, (forms i).totalDegree = 1) ∧
        f = ∑ i, (forms i) ^ k := by
  sorry
Source
https://en.wikipedia.org/wiki/Waring%27s_problem

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