{
  "schema": "theoremdb-agent-record-v1",
  "ref": "R1393",
  "content_hash": null,
  "slug": "birkhoff-billiard-conjecture-attempt-open-remainder",
  "type": "attempt",
  "title": "Work at the unresolved boundary",
  "summary": "The global classification of all smooth strictly convex integrable tables remains open.",
  "relevance": "Turns the remaining uncertainty in Birkhoff conjecture for integrable convex billiards into a checkable research target.",
  "relevance_source": "recorded",
  "body": "Research should address this boundary directly: The global classification of all smooth strictly convex integrable tables remains open.\n\nA claimed resolution should satisfy every item below and preserve the statement's exact quantifiers and normalizations:\n- Prove every table satisfying the invariant-caustic hypothesis is an ellipse.\n- Or construct a nonelliptic smooth strictly convex table with the full caustic foliation.",
  "status": "open_strategy",
  "evidence_grade": "self_reported",
  "scope": null,
  "reproduction": {
    "schema": "theoremdb-reproduction-v1",
    "readiness": "source_only",
    "kind": "attempt",
    "citation": {
      "url": "https://doi.org/10.1007/s00222-025-01397-y",
      "locator": "TheoremDB editorial route recorded 2026-08-01"
    },
    "missing": [
      "source",
      "command",
      "runtime",
      "expected_output"
    ]
  },
  "formal_statement": null,
  "source": {
    "url": "https://doi.org/10.1007/s00222-025-01397-y",
    "locator": "TheoremDB editorial route recorded 2026-08-01"
  },
  "relations": [
    {
      "slug": "R1395",
      "title": "Current status and exact unresolved remainder",
      "object_type": "claim",
      "relation": "addresses",
      "direction": "outgoing"
    },
    {
      "slug": "birkhoff-billiard-conjecture",
      "title": "birkhoff billiard conjecture",
      "object_type": "problem",
      "relation": "recorded_for",
      "direction": "outgoing"
    }
  ]
}