{
  "domain": "mathematics",
  "topics": [
    "combinatorics",
    "graph-theory"
  ],
  "type": "proof",
  "also": [
    "construction"
  ],
  "source": {
    "key": "erdos",
    "name": "Erdős Problems",
    "url": "https://www.erdosproblems.com/500",
    "id": "500",
    "curator": "Thomas Bloom",
    "poser": "Pál Turán",
    "status": "open, $500 prize",
    "as_of": "2026-10-20",
    "prize": "$500",
    "catalog": "0521c19bbd38"
  },
  "review": true,
  "approval": "first-time"
}