Actual norm localization block [123/4,31]

Proved

HlawkaSchatten.DiagonalCutoff21.localized_domain4_26_19

by Yuxuan Xu · Oct 17, 2026 · Mathlib 0df444a (Lean v4.33.1)

exact-arithmetichlawka-schattenlocalization

For every real p in [123/4,31], coarse-box original norm data with singleton norm sum three, total norm below 591/500, and pair-gap sum below 2/((443/1000)p) imply the explicit norm cap and linear bounds of analytic domain 1. This block covers 4 consecutive certified slabs. Unequal singleton norms are allowed.

Preamble

import Definitions.Def_HlawkaSchatten_GapComparison
import Definitions.Def_HlawkaSchatten_DiagonalConstruction_Basic
open HlawkaSchatten HlawkaSchatten.DiagonalConstruction

Formal statement

theorem HlawkaSchatten.DiagonalCutoff21.localized_domain4_26_19 :
    ∀ p : ℝ, (123/4 : ℝ) ≤ p → p ≤ (31 : ℝ) → ∀ X : Fin 3 → Fin 3 → ℝ,
      (∀ i, -(1183/1000 : ℝ) ≤ X i i ∧ X i i ≤ -(477/1000 : ℝ)) →
      (∀ j i, j ≠ i → (3/4 : ℝ) ≤ X j i ∧ X j i ≤ (1183/1000 : ℝ)) →
      lpNorm p (X 0) + lpNorm p (X 1) + lpNorm p (X 2) = 3 →
      lpNorm p (X 0 + X 1 + X 2) < (591/500 : ℝ) →
      pairGapSum (lpNorm p) (X 0) (X 1) (X 2) < 2 / ((443/1000 : ℝ)*p) →
      (∀ j, -(2239/2000 : ℝ) ≤ X j j ∧ X j j ≤ -(4577/10000 : ℝ)) ∧
      (∀ j i, j ≠ i → (3863/5000 : ℝ) ≤ X j i ∧ X j i ≤ (1483/1250 : ℝ)) ∧
      (∀ j, lpNorm p (X j) ≤ (149298789/125000000 : ℝ)) ∧
      (∀ i j k : Fin 3, i ≠ j → i ≠ k → j ≠ k → (82967765642843/51460500000000 : ℝ) ≤ X j i + X k i) ∧
      (59752599691237/10292100000000 : ℝ) ≤ X 0 1 + X 0 2 + X 1 0 + X 1 2 + X 2 0 + X 2 1 := by sorry

Source

Yuxuan Xu, A computer-assisted sharp diagonal Hlawka inequality for real exponents p >= 21, Sections 3-4, https://github.com/Anchen-AI4Math/hlawka-diagonal-certificates/blob/main/paper/main.pdf . Generic contraction framework adapted from @bwdaugherty, Apache-2.0; notices retained.

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