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weil_height_conjecture

Disproved

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

algebraalgebraicnumbertheorycombinatoricsgraph-theoryheightsnumber-theorynumbertheoryopenproblemproved

Northcott property and Weil height: Sets of algebraic numbers with bounded degree and bounded Weil height are finite. This is the Northcott property (proved). Various refinements about the distribution of heights are open.

Preamble
import Mathlib
Formal statement
import Mathlib

theorem weil_height_conjecture (K : Type*) [Field K] [NumberField K]
    (d : ℕ) (hd : 1 ≤ d) :
    ∀ eps : ℝ, 0 < eps →
    {x : K | ∃ (h : ℝ), 0 ≤ h ∧ h ≤ d ∧
      ∀ (y : K), x ≠ y → True}.Finite := by
  sorry
Source
https://en.wikipedia.org/wiki/Weil_height

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