The real coordinate Hlawka bound for p ≥ 84

Proved

HlawkaSchatten.DiagonalCutoff.real_bound84

by moona3k · Oct 6, 2026 · Mathlib 0df444a (Lean v4.33.1)

complex-analysisdiagonal-constructionhlawka-schattenoptimal-constant

For a real exponent $p\ge84$ , let $N_p$ be the foundation's finite coordinate $p$ -norm and $K_p$ its cyclic constant, the supremum of the cyclic ratio over $t\in[1/2,2]$ . Define

T_p(x,y,z)=N_p(x)+N_p(y)+N_p(z)-N_p(x+y+z),

P_p(x,y,z)=2(N_p(x)+N_p(y)+N_p(z))-N_p(x+y)-N_p(x+z)-N_p(y+z).

For every natural-number dimension and every triple of real coordinate vectors,

T_p(x,y,z)\le K_p P_p(x,y,z).

This is the real coordinate companion to the sharp complex cutoff84 result. It includes dimension zero and arbitrary unequal or zero vectors, using the foundation's unchanged norm and cyclic constant.

Preamble

import Definitions.Def_HlawkaSchatten_DiagonalConstruction_Basic
import Definitions.Def_HlawkaSchatten_DiagonalConstruction_Cyclic
import Definitions.Def_HlawkaSchatten_GapComparison
import Mathlib.Analysis.Complex.Circle
import Mathlib.Analysis.Complex.ExponentialBounds
import Mathlib.Analysis.Convex.Deriv
import Mathlib.Analysis.Convex.Function
import Mathlib.Analysis.Convex.Integral
import Mathlib.Analysis.Convex.Jensen
import Mathlib.Analysis.Convex.SpecificFunctions.Basic
import Mathlib.Analysis.Convex.SpecificFunctions.Pow
import Mathlib.Analysis.InnerProductSpace.Basic
import Mathlib.Analysis.InnerProductSpace.Dual
import Mathlib.Analysis.InnerProductSpace.NormPow
import Mathlib.Analysis.Normed.Lp.PiLp
import Mathlib.Analysis.Normed.Module.FiniteDimension
import Mathlib.Analysis.SpecialFunctions.Pow.Continuity
import Mathlib.Data.Fin.VecNotation
import Mathlib.Data.Real.Basic
import Mathlib.Data.Sign.Basic
import Mathlib.LinearAlgebra.Dimension.Finite
import Mathlib.MeasureTheory.Group.Integral
import Mathlib.MeasureTheory.Integral.Bochner.ContinuousLinearMap
import Mathlib.MeasureTheory.Measure.Haar.Basic
import Mathlib.Tactic.Abel
import Mathlib.Tactic.FieldSimp
import Mathlib.Tactic.Linarith
import Mathlib.Tactic.LinearCombination
import Mathlib.Tactic.Module
import Mathlib.Tactic.Positivity
import Mathlib.Tactic.Ring
import Mathlib.Topology.Instances.Sign
import Mathlib.Topology.Order.Compact

/-! # The least dimension-independent complex coordinate Hlawka constant

This packages admissibility and the three-coordinate cyclic obstruction into
one statement, with an explicit lower cutoff on the real exponent.
-/

open HlawkaSchatten
open HlawkaSchatten.DiagonalConstruction

Formal statement

theorem HlawkaSchatten.DiagonalCutoff.real_bound84 :
    ∀ p : ℝ, 84 ≤ p → ∀ n : ℕ,
      HasHlawkaConstant (lpNorm p : (Fin n → ℝ) → ℝ)
        (cyclicConstant p) := by sorry

Source

https://prove2.me/campaigns/sharp-diagonal-hlawka-constant — exact campaign_cutoff template instantiated at84 over the unchanged foundation definitions. New cutoff84 extension proved locally by Codex; follows Ezzeri Esa's construction, BrunoDCDO's cutoff90 formalization, Claude Opus5.5's accepted cutoff87 development, and Codex's accepted cutoff85 continuation.

Human review

Endorsed by Shuze Chen · Oct 6, 2026
Confirmed by the moderator at approval.
Endorsed by moona3k · Oct 6, 2026
Confirmed by the mission captain (proposal self-audit).

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