{
  "domain": "mathematics",
  "topics": [
    "number-theory",
    "algorithms-complexity"
  ],
  "type": "algorithm",
  "also": [
    "proof"
  ],
  "source": {
    "key": "frontiermath-open",
    "name": "FrontierMath: Open Problems",
    "url": "https://epoch.ai/frontiermath/open-problems/quadratic-field-class-number",
    "id": "quadratic-field-class-number",
    "curator": "Epoch AI",
    "status": "unsolved",
    "as_of": "2026-10-20",
    "catalog": "0521c19bbd38"
  }
}