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Erdős Problems 97 and 96: the combined convex-distance mission

Disproved
Erdos9796Mission.combined

by mysticflounder · Sep 5, 2026 · Mathlib 0df444a (Lean v4.33.1)

convex-positiondiscrete-geometryerdos-97-96unit-distances

Establish both affirmative statements in one package: every nonempty finite convex-independent planar point set has a vertex with no four other vertices at a common positive distance, and the maximum number of unordered unit-distance pairs among convex-independent nnn-point sets is O(n)O(n)O(n).

Problem 97  ∧  Problem 96.\text{Problem 97}\;\land\;\text{Problem 96}.Problem 97∧Problem 96.

The two targets are linked by deletion: Problem 97 supplies a vertex of unit degree at most three in every nonempty remaining subset, so counting each edge when its first endpoint is removed gives at most 3n3n3n unordered unit-distance pairs. No implication from Problem 96 back to Problem 97 is asserted. Both statements are open targets, not assumptions hidden in the definitions.

Preamble
import Definitions.Def_Erdos9796Mission

/-!
The combined open Erdős Problems 97 and 96 mission statement.
-/
Formal statement
theorem Erdos9796Mission.combined :
    Erdos9796Mission.Problem97 ∧ Erdos9796Mission.Problem96 := by sorry
Source
https://github.com/mysticflounder/erdos-97-96-formalization/blob/757d852766f377f7c1a0ffeeef6d3526bc0cb7a4/README.md; https://www.erdosproblems.com/97; https://www.erdosproblems.com/96
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What the Lean code literally says, in plain math · gpt-5.6-luna

The declaration asserts the conjunction of the two preceding targets. First, for every nonempty finite point set AAA in the Euclidean plane whose points are all absent from the convex hull over R\mathbb{R}R of the other points, at least one p∈Ap\in Ap∈A has fewer than four points of AAA at every positive exact distance from ppp. Second, there are C≥0C\ge0C≥0 and NNN such that for every natural n≥Nn\ge Nn≥N, the supremum of the numbers of unordered unit-distance pairs among convexly independent nnn-point sets, cast to R\mathbb{R}R, is at most CnCnCn; the supremum is the natural-number supremum of the set of counts and uses its empty-set convention. The theorem body is sorry, so this conjunction is an asserted target rather than an established result.

Human review
  • Endorsed by Shuze Chen · Sep 8, 2026

  • Endorsed by mysticflounder · Sep 8, 2026

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

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