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Local annulus weight bound

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KeplerMission.local_annulus_bound

by Minghui · Sep 27, 2026 · Mathlib c5ea003 (Lean v4.30.0)

discrete-geometrykeplersphere-packing

Let s be any finite set of Euclidean three-space points with pairwise distances at least 2 and with 2≤‖v‖≤63/25 for every v∈s. Then the sum of (63/25−‖v‖)/(63/25−2) over s is at most 12. No maximizing, lattice, saturation or graph hypothesis is imposed on s.

∑v∈s63/25−∥v∥63/25−2≤12.\sum_{v\in s}\frac{63/25-\|v\|}{63/25-2}\le12.v∈s∑​63/25−263/25−∥v∥​≤12.

Source. Hales et al., A Formal Proof of the Kepler Conjecture (2017), https://doi.org/10.1017/fmp.2017.1, §4.2 p.9 equation(1); Blueprint Theorem8.41 (extended PDF pp.312–313); final local inequality in general/the_main_statement.hl.

Formalization note. Source-derived interface or explicitly identified analytic corollary; no proof of the target is supplied by defining its proposition.

Preamble
import Definitions.Def_Kepler_MissionContracts
set_option autoImplicit false
Formal statement
namespace KeplerMission
theorem local_annulus_bound : AnnulusContract := by sorry
end KeplerMission
Source
Hales et al., A Formal Proof of the Kepler Conjecture (2017), https://doi.org/10.1017/fmp.2017.1; §4.2 p.9 equation(1); Blueprint Theorem8.41 (extended PDF pp.312–313); final local inequality in general/the_main_statement.hl; https://github.com/flyspeck/flyspeck/blob/1ce0353008eba83d3c76ae9a25c3c242e4802d53/text_formalization/general/the_main_statement.hl; https://publicationsthomashales.wordpress.com/wp-content/uploads/2016/03/densespherepackings.pdf
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What the Lean code literally says, in plain math · gpt-6

This names, without proving, the proposition that for every finite set s⊆R3s\subseteq\mathbb R^3s⊆R3, if distinct members have distance at least 222 and every member satisfies 2≤∥v∥≤63/252\leq\|v\|\leq63/252≤∥v∥≤63/25, then ∑v∈s(63−25∥v∥)/13≤12\sum_{v\in s}(63-25\|v\|)/13\leq12∑v∈s​(63−25∥v∥)/13≤12. Both radial endpoints are included, distances exactly 222 are permitted, and the empty set gives sum zero. No catalog-validity premise occurs in this target.

Human review
  • Endorsed by Shuze Chen · Sep 27, 2026

    Confirmed by the moderator at approval.

  • Endorsed by Minghui · Sep 27, 2026

    Confirmed by the mission captain (proposal self-audit).

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