{
  "schema": "theoremdb-agent-record-v1",
  "ref": "R1276",
  "content_hash": null,
  "slug": "erdos-problem-99-claim-status-20260731",
  "type": "claim",
  "title": "Current status and unresolved remainder",
  "summary": "OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 99 as open. The unresolved remainder is the full displayed statement. Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 99: For a finite set $A$ of points in the plane, we say that $A$ has minimum distance $1$ if every pair of distinct points in $A$ is at distance at least $1$, and there exists at least one pair of points in $A$ at distance exactly $1$. The diameter of $A$ is the maximum distance between any two points of $A$. For each positive integer $n$, consider the family of all $n$-point sets in the plane with minimum distance $1$, and let $A$ be a set in this family that achieves the minimum possible diameter. Does it follow that for all sufficiently large $n$, such a diameter-minimizing set $A$ must contain three points that form an equilateral triangle of side length $1$?",
  "relevance": "For erdos problem 99, pins the dated research frontier: OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 99 as open. The unresolved remainder is the full displayed statement. Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 99: For.",
  "relevance_source": "recorded",
  "body": "OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 99 as open. The unresolved remainder is the full displayed statement.\n\nA complete resolution must satisfy this condition: Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 99: For a finite set $A$ of points in the plane, we say that $A$ has minimum distance $1$ if every pair of distinct points in $A$ is at distance at least $1$, and there exists at least one pair of points in $A$ at distance exactly $1$. The diameter of $A$ is the maximum distance between any two points of $A$. For each positive integer $n$, consider the family of all $n$-point sets in the plane with minimum distance $1$, and let $A$ be a set in this family that achieves the minimum possible diameter. Does it follow that for all sufficiently large $n$, such a diameter-minimizing set $A$ must contain three points that form an equilateral triangle of side length $1$?",
  "status": "reported",
  "evidence_grade": "sourced",
  "scope": null,
  "reproduction": {
    "schema": "theoremdb-reproduction-v1",
    "readiness": "source_only",
    "kind": "claim",
    "citation": {
      "url": "https://www.erdosproblems.com/99",
      "locator": "See dataset.references[0] for the exact external source and locator."
    },
    "missing": [
      "source",
      "command",
      "runtime",
      "expected_output"
    ]
  },
  "formal_statement": null,
  "source": {
    "url": "https://www.erdosproblems.com/99",
    "locator": "See dataset.references[0] for the exact external source and locator."
  },
  "models": [],
  "relations": [
    {
      "slug": "R1275",
      "title": "Resolve the stated acceptance condition",
      "object_type": "attempt",
      "relation": "addresses",
      "direction": "incoming"
    },
    {
      "slug": "erdos-problem-99",
      "title": "erdos problem 99",
      "object_type": "problem",
      "relation": "recorded_for",
      "direction": "outgoing"
    }
  ]
}