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erdős #90 · unit distance problem

← #89 · #91 (packet.json; erdosproblems.com)

Does every set of distinct points in contain at most many pairs which are distance 1 apart?

Worked, still open.

geometry · solved · prize $500 · formalized (Lean) · 0 attempts

machinery: unit-distance-problem,incidence-geometry,Szemeredi-Trotter,extremal-graph-theory,geometric,explicit-construction-witness

use this record

vela registry pull vfr_37aec80d874a0239
vela reproduce examples/erdos-problems

evidence

unverified AI candidates (2)

gpt-erdos · GPT-5.2 Pro + Deep Research · unverified

This is the **Erdős unit distance problem**. Let $U(n)$ be the largest possible number of pairs $\\{p,q\\}$ at distance $1$ among $n$ points in the plane.

candidate solution ↗

llm-hunter · gpt 5.2, gpt pro 5.2 · unverified

2 LLM attack(s) recorded (gpt 5.2, gpt pro 5.2); unverified.

candidate solution ↗

formal

AMS 52 · test (literature)

theorem unitDistanceCounts_BddAbove (n : ℕ) : BddAbove <| unitDistanceCounts n
formal-conjectures/90.lean ↗

oeis

status

solved

notary

vela reproduce examples/erdos-problems
  • packet.json · sha256 4da9a4f1c0f952112e258e040b422cb2139cd025d0c994d4acbfd57cdf95a26c

finding.noted · reviewer:will-blair · 1 day

renders the record as of vev_d199cb2e · 1,338 events · hub

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