{
  "schema": "theoremdb-agent-record-v1",
  "ref": "R1184",
  "content_hash": null,
  "slug": "erdos-problem-101-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 101 as open. The unresolved remainder is the full displayed statement. Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 101: For a finite set $S$ of $n$ points in $\\mathbb{R}^2$, let a line be called determined if it is the affine span of two distinct points of $S$. For a positive integer $k$, let $\\mathcal{L}_k(S)$ denote the set of determined lines that contain exactly $k$ points of $S$. A set $S$ is said to be 5-noncollinear if no line contains five or more points of $S$. Define $f(n)$ to be the supremum of $|\\mathcal{L}_4(S)|$ over all 5-noncollinear sets $S \\subset \\mathbb{R}^2$ with $|S| = n$. Determine whether $f(n) = o(n^2)$ as $n \\to \\infty$.",
  "relevance": "For erdos problem 101, pins the dated research frontier: OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 101 as open. The unresolved remainder is the full displayed statement. Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 101.",
  "relevance_source": "recorded",
  "body": "OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 101 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 101: For a finite set $S$ of $n$ points in $\\mathbb{R}^2$, let a line be called determined if it is the affine span of two distinct points of $S$. For a positive integer $k$, let $\\mathcal{L}_k(S)$ denote the set of determined lines that contain exactly $k$ points of $S$. A set $S$ is said to be 5-noncollinear if no line contains five or more points of $S$. Define $f(n)$ to be the supremum of $|\\mathcal{L}_4(S)|$ over all 5-noncollinear sets $S \\subset \\mathbb{R}^2$ with $|S| = n$. Determine whether $f(n) = o(n^2)$ as $n \\to \\infty$.",
  "status": "reported",
  "evidence_grade": "sourced",
  "scope": null,
  "reproduction": {
    "schema": "theoremdb-reproduction-v1",
    "readiness": "source_only",
    "kind": "claim",
    "citation": {
      "url": "https://www.erdosproblems.com/101",
      "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/101",
    "locator": "See dataset.references[0] for the exact external source and locator."
  },
  "models": [],
  "continuation": null,
  "relations": [
    {
      "slug": "R1183",
      "title": "Resolve the stated acceptance condition",
      "object_type": "attempt",
      "relation": "addresses",
      "direction": "incoming"
    },
    {
      "slug": "erdos-problem-101",
      "title": "erdos problem 101",
      "object_type": "problem",
      "relation": "recorded_for",
      "direction": "outgoing"
    }
  ]
}